GeoDrilling International July/August 2014

ESTABLISHED 1993

Directional drilling

Proving its adaptability

Australasia

Update on mineral exploration technology

Construction drilling

New foundations and rigs

ISSN 0969-3769 CovIGDI1407.indd 1

July / August 2014

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CONTENTS

1

The buzz about quarries

R

eports about a substantial decline in bumblebee populations have been going around for some years, and now quarrying companies in the UK are being urged to do their bit for these pollinators.

A summer’s day would really not be the same without these black-and-yellow-striped little creatures buzzing about the garden, but even if you aren’t a big fan of flying insects, the ‘plight of the bumblebee’ should be a cause of worry for everyone. The bumblebees, which come in 24 species in the UK, play an important part in the ecosystem as pollinators of agricultural crops and wild plants.

According to the Bumblebee Conservation Trust (BBCT) in the UK, in the last 80 years bumblebee populations have plummeted, with two species now nationally extinct and others in danger. The UK is naturally not the only region affected; the same trend has been observed in the rest of Europe, North America and Asia.

Reasons behind this decline include pesticides and diseases, and changes in agricultural practices and a lack of wild-flower grasslands leading to habitat loss. This is where the construction quarries can lend a helping hand – apparently the land disturbances can allow some wild flowers to flourish.

In November 2012, the BBCT and the Mineral Products Association (MPA) signed a memorandum of understanding to work together on the protection, creation and restoration of flower-rich areas and extending quarry workers’ knowledge about bumblebees.

“The ‘plight of the bumblebee’ should be a cause of worry for everyone”

At the time, Nigel Jackson, chief executive of the MPA, said: “MPA members have a long legacy of high-quality restoration and are uniquely placed to protect and enhance biodiversity and help arrest the decline of rare and threatened species and habitats. This partnership will enable the industry to help do what we can for bees, which are under threat and play a crucial part in maintaining ecosystem services.”

Since then, BBCT has visited five quarries and witnessed first-hand how quarries can be beneficial for wildlife. The trust is now eager to get quarry workers to monitor the bumblebees on their sites, as well as encouraging quarries to plant trees that are vital for bees; BBCT names the goat willow, for example, which produces high-quality nectar and pollen in March, when bumblebees are emerging from hibernation.

The BBCT states that the importance of bees should not be underestimated – the economic value of bees, as pollinators of commercially grown insect-pollinated crops, has been estimated at over £500 million (US$850 million) per year in the UK.

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Features Directional drilling Australasia Construction drilling Auger drilling Special report: Sandvik DR461i Special report: Marini at Manchester Contacts

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Classified advertising

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Next month Rough-terrain drilling Core drilling and borehole logging Down-the-hole hammers and bits Italy

COVER

For more information visit: bumblebeeconservation.org NIA KAJASTIE, EDITOR nia.kajastie@aspermontmedia.com For news and updates, follow me on Twitter @GDI_Ed_Nia Download our app from the iTunes App Store and get your GDI to read on the go!

News

Massenza’s MI8 has been delivered to the UK for geothermal boreholes. The rotary head is equipped with the casing drive system which eliminates the need for a double drive head. The rig can also perform water wells to a depth of more than 250m.

With the tilting rack, it is easy to load/unload the drill pipes and just one operator can handle the rig with a remarkable reduction in labour costs. Since 1921, Massenza remains a pathfinder in the water research field. www.massenzarigs.it

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NEWS

LDD to pile at Port Hedland Marine and subsea foundation specialist LDD (Large Diameter Drilling) is to supply pile-top drilling equipment and personnel to install piles at the new Roy Hill iron-ore export facility at Port Hedland, Western Australia.

LDD will use the Drive Drill Drive technique to install 1,050mm- and 1,200mmdiameter piles.

“LDD Australia will have worked on all the major iron-ore export facilities in Port Hedland for the past four years,” said James Tuckwell, general manager of LDD Australia. “This will be the third pile-top drilling equipment project we have secured in Australia this year.”

UK construction industry receives government boost Plans detailing billions of pounds worth of proposed construction projects have been published by the UK government, in partnership with construction intelligence specialist Barbour ABI. At the Government Construction Summit in early July, Vince Cable, secretary of state for business, innovation and skills, announced that the pipeline of future government construction opportunities is £116 billion (US$197 billion).

The information, collated

by Barbour ABI, reveals

upcoming public projects, with the intention of providing firms of all sizes with the forward notice and information they need to invest in the relevant skills, labour and capabilities to win contracts.

Michael Dall, lead economist at Barbour ABI, commented: “These latest figures represent a huge boost to the UK construction industry.

“Hopefully the government pipeline will help to increase optimism across the industry, which was strongest towards the end of 2013, when output rose at its

fastest rate for more than six years.

“Plans of new projects and significant spend in the infrastructure sector should help to dispel concerns that the industry is becoming too reliant on the housing sector.

“We must also not forget the recent reports of skills shortages affecting the construction industry. With construction jobs accounting for 10% of total employment in the UK, addressing these supply-side constraints is crucial to ensure the long-term health of the industry going forward.”

Bauer gets busy with replacing Schwarzkopf Tunnel Deutsche Bahn (DB), the German railway company, is having a new track section constructed between Würzburg and Frankfurt, to replace the existing passage through the Schwarzkopf Tunnel.

Bauer Spezialtiefbau will carry out the specialist foundation work in a joint venture with Alfred Kunz Untertagebau, Baresel, Schälerbau Berlin and Leonhard Weiss & Co. The Schwarzkopf Tunnel no longer meets modern rail requirements; passenger trains – including ICE high-speed trains – must slow down to 70km/h when travelling through it. In addition, freight trains require a second locomotive to handle the steep grade from Aschaffenburg to Heigenbrücken.

The contractor for the new section of track is DB’s construction subsidiary, DB ProjektBau. It will take four

Two BG 40 rigs are currently on site working on the tunnel bypass

new tunnels to reduce the grade; the 2,600m-long Falken Tunnel will replace the Schwarzkopf Tunnel, and the three others will be cut through the terrain to make the grade flatter in the future.

The work done by Bauer Spezialtiefbau on the approximately €43 million (US$58 million) contract will include sections of tunnel construction with open-cut rather than mining technology, with a total length of 2,800m. This is the case for most of the tunnel sections

in the flatter terrain.

The excavation pits for these sections will be stabilised with piled walls and retaining walls. In addition, pile foundations with a total length of 50,000m will be constructed for the embankments of the new track section using the continuous flight auger (CFA) method.

Furthermore, soil nailing, reinforcements and anchorages will be installed along 550m of existing track. In order to prepare for the

mining tunnel work, portal excavations were dug and shotcrete walls with heights of up to 30m were built for the ten tunnel portals included in the project. This work was done by Bauer Spezialtiefbau together with SPESA Spezialbau and Sanierung, another Bauer Group company.

The piles, whose diameters range from 900mm to 1,500mm, will be deployed in hard diorite, gneiss and coloured sandstone. They extend to a depth of 25m, where they are integrated into the bedrock for lengths of up to five metres.

Currently, two BG 40, two BG 28 and one BG 20, three anchor drilling rigs and a number of nail-drilling rigs and shotcrete units are being utilised. The new track section will be finished by the end of 2017. The major work by Bauer will be completed by autumn 2015.

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NEWS

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Meridian signs new Ethiopia contract Meridian Drilling has signed its third contract working with Circum Minerals on the G&B project in Ethiopia.

The contract will involve 5,000m of drilling on phase three of the potash project, which is based in the Danakil Depression.

The Meridian team will be working with two Cortech YDXL diamond-drilling rigs and using a full tri-salt mud system to prevent dissolution of potash salts.

Meridian director Carolyn Evans, who is based in Ethiopia, said: “With four years’ experience in Ethiopia, our team has considerable expertise when it comes to dealing with the logistical and environmental challenges of working in the Danakil Depression, and we are looking forward to working with Circum Minerals once again.”

The project team will be supported

by Meridian’s country office in Addis Ababa.

Meridian Drilling has recently also returned to the Republic of Congo after signing a new contract with Elemental Minerals for a 1,500m drilling-exploration programme on the Dougou Prospect.

Furthermore, the UK-headquartered company won a new contract with Allana Potash in Ethiopia.

Dallol crater in the Danakil Depression, where Meridian Drilling is working again

Meet the Difference!

Upgraded from the reliable CRS XL platform SonicSampDrill proudly presents the MidRotoSonic XL Max 50k. The full 150Hz Sonic power in a relatively small package increases your drilling speed, capacity and boosts productivity.

Major Drilling to acquire Taurus Drilling Major Drilling has agreed to purchase the operations of Taurus Drilling Services, which operates in Canada, the US and Mexico, providing underground percussive/longhole drilling to mining companies.

Major Drilling will acquire 39 drill rigs, together with related equipment, inventory and contracts, and will retain the Taurus management team and staff.

Over the past year Taurus has produced revenue of US$35.4 million and earnings before interest, taxes, depreciation and amortisation of US$7.4 million.

Subject to adjustment under the agreement, Major Drilling will pay US$25.7 million on closing and an additional maximum of US$10.7million tied to performance.

Francis McGuire, president and CEO of Major Drilling, commented: “We are very pleased to welcome Taurus Drilling Services and its employees into the Major Drilling group. The acquisition opens the door to additional diversification in the mining industry as percussive longhole drilling is more related to the production function of a mine.”

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NEWS

DAT instruments’ datalogger (left) is assisting the development of the Riyadh Metro, which is due to be completed in 2018

Testing Riyadh’s soil for Metro project DAT instruments’ dataloggers have been employed on the Riyadh Metro project in Saudi Arabia.

With a population close to six million, predicted to increase to eight million by 2030, the Saudi capital is focusing on augmenting the efficiency of public transport and reducing traffic congestion. The metro is part of the RPTP (Riyadh Public Transport Project), which combines bus and train networks.

The construction of the Riyadh Metro started in January 2014, with a planned deadline for 2018.

According to the Arriyadh Development Authority, which manages the whole operation, the project will generate around 15,000 new jobs.

The project consists of a total of 85 stations over 178km. The construction of the tunnels and stations below the stratum level required a geological study

focused on soil permeability.

DAT instruments’ partnered consulting company undertook double-packer tests using DAT’s Lugeon/ Lefranc test datalogger, the JET DSP 100/IR, in order to understand and record water flow, pressure and final volume.

The data, which was fundamental for performing both accurate construction design for all tunnels and stations, were extracted from the Italian company’s

dataloggers. The JET DSP 100/IR, also available for cement injection applications, is specifically designed for Lugeon and Lefranc tests.

The datalogger displays these parameters in real time on its screen. Stored data can be transferred to a PC for report filing and printing, to access the daily summary information related to the injections and/or to export the data to Excel spreadsheets.

Safety guidance warns of piling rig instability The UK’s Federation of Piling Specialists (FPS) has issued a guidance document that highlights situations where piling rigs can become unstable through over-flighting during continuous flight auger (CFA) piling.

The document, which is available for download from the FPS website (www.fps. org.uk), is aimed at piling contractors, geotechnical designers, planning supervisors and others involved with the specification, selection and procurement of CFA piling. It provides background information to the flighting mechanism,

helping identify some of the situations where the risk of over-flighting is likely to occur.

In addition, the document details some of the options that are available to piling specialists, and presents best practice that can help

Over-flighting can have dire consequences

reduce the risk of rig instability and further enhance safety of operations on-site.

Speaking about the guidance document, Martin Blower, chairman of FPS, said: “CFA piling is widely used, and there have been a number of notable rig overturns recently. What this document does is raise wider awareness of the potential risks of over-flighting, loss of support and stability of the working platform that may result in a piling rig or attendant crane overturning. More importantly, the document encourages robust risk

management and the controls to be implemented to mitigate such risk.”

The document is not intended to replace the requirements to use competent supervision and operatives when undertaking CFA piling, but as an additional information source offering guidance.

Blower added: “Safety is fundamentally important and we [FPS] encourage all those involved in CFA piling to look at the guidance document and circulate it widely to all those actively participating either in the specification or the delivery of CFA piling on sites.”

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NEWS

5

eqUiPMenT

Casagrande launches C5XP micropiling rig Casagrande’s new C5XP micropiling rig is particularly suited for medium and heavy-duty work in confined spaces.

The 8t machine is equipped with a swivel mechanism with a ‘front the wall’ device that allows rotation of the mast by 100°. The multiplicity of possible movements allows it to face any drilling angle using different technologies: micropiles, tie rods and jet grouting.

Powered by an EU Stage IIIB 85kW Deutz engine, this machine has two different types of head rotation (12,170Nm and 7,200Nm respectively) and a mast with different rotary movements for the use of drilling rods of 1,500mm, 2,500mm and 3,000mm.

The 50kN gearbox push and pull device, connected to clamp and unscrewing devices of different sizes (254mm or 159mm), allows DTH, tricone and propeller heavy drilling.

The undercarriage has a standard width of 1,600mm, but in order to respond to different needs, an optional width of 1,800 mm, extendable tracks of 1,600/2,200mm or oscillating tracks are available.

Kensa expands its Shoebox pump range

Kensa Heat Pumps, a UK manufacturer of ground-source heat pumps (GSHP), has added a new solution to its product range for communal dwellings in the shape of the 6kW Shoebox Twin.

Kensa’s latest product is an evolution of the 3kW Shoebox heat pump.

The 6kW Twin boasts a greater capacity and heat output than its forerunner, but is still capable of being sited within tight spaces inside a dwelling. And through the use of twin compressors, it delivers domestic space and water heating to larger new-build and well-insulated retrofit apartments and medium-sized houses.

This small GSHP offers a low acoustic output, and at 560mmx605mmx565mm is an attractive solution where the heat pump has to be located inside the dwelling.

The Shoebox range enables housing associations and developers to plug into UK government subsidies such as the Renewable Heat Incentive.

The ‘full load sensing’ hydraulic system means that the drilling tool is used at maximum power, while programmable logic control allows considerable fuel savings and high-performance drilling, all through an easy and intuitive control. The C5XP is available remote-controlled or with a hydraulic control panel.

Casagrande’s new C5XP

The Difference in Safety!

Safety isn’t expensive, it’s priceless. The MRS XL Max is equipped with a fully automated Rod/Casing Handler, Magnetic Hydraulic Rod/Casing Loader, SPT autodrop hammer and Triple Floating Clamps.

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NEWS

In Brief Crux recognised US contractor Crux recently recieved three industry awards for design-build foundation work and the introduction of an innovative steel pile cap design on the Sunrise Powerlink Project. This included the DFI Outstanding Project Award, the C. William Bermingham Innovation Award and the first-ever World Cup of Micropiles.

Geofluid update More than 90% of the exhibiting space has already been sold for the 20th edition of Geofluid, the international trade show for well and soilinvestigation drilling, special foundations, underground works, geotechnical engineering and geology, in Piacenza, Italy, on October 1-4.

Hillhead wrap-up A total of 17,559 trade visitors attended this year’s Hillhead trade show, held on June 24-26 at Lafarge Tarmac’s Hillhead Quarry, near Buxton, UK. Around 450 equipment manufacturers, contractors and suppliers from the mineral products, construction and recycling industries took part.

Boart backs DRiLL 2014 Boart Longyear will be the major sponsor of the Australian Drilling Industry Association’s DRILL 2014 conference on August 19-20 at the Gold Coast Convention & Exhibition Centre in Gold Coast, Queensland. Held every two years, DRILL is Australia’s only national drilling conference.

SonicSampDrill raises the bar Sonic rig and tooling specialist SonicSampDrill, based in the Netherlands, released the new MidRotoSonic XL Max in early July.

Evolved from the CRS XL platform, the MRS XL Max is specifically designed to host the LS 50k sonic head. This means operators will have the maximum sonic output power at their disposal, with simultaneous rotation and vibration, in a small and manoeuvrable rig.

The combination makes the MRS XL Max efficient in a wide variety of applications, from mineral exploration and

The MRS XL Max

geotechnical drilling to environmental drilling and sampling.

Huug Eijkelkamp, commercial director at SonicSampDrill, commented: “Because we focused on making the MRS a multi-employable rig, we paid special attention to further developing all our safety features.

“The MRS XL Max is, among other features, equipped with a magnetic hydraulic rod/casing handler and a fully automated rod/ casing handler.”

SonicSampDrill will display this rig in the US at the South Atlantic Jubilee in Myrtle Beach and at NGWA in Las Vegas later this year.

Doosan introduces new portable compressors Doosan Portable Power has launched the new Stage IIIB-compliant 7/125-10/110 and 14/90 portable air compressors, replacing the previous Stage IIIA 7/120, 9/110, 10/105 and 14/85 models.

The 7/125-10/110 model has a new Dual Mode feature as standard, with a choice of two pressure and flow ratings on the same machine. By pushing a button on the keypad, the operator can switch between LO (low pressure mode: rated pressure 6.9bar/free air delivery of 12m³/min) and HI (high pressure mode: rated pressure 10.3bar/free air delivery 10.6m³/min).

With a free air delivery of 8.3m3/min at an operating pressure of 13.8bar, the second new model, the 14/90, is available for higher pressure applications and can be supplied with a traditional dual pressure switch as an option.

The new portable com-

pressors are powered by the Stage IIIB Cummins QSB 4.5 water-cooled diesel engine providing 97kW of power and meeting emission regulations through the use of cooled exhaust-gas recirculation and diesel oxidation catalyst aftertreatment technologies, without the need for a diesel particulate filter.

The new 7/125-10/110 and 14/90 portable compressors cover a wide range of applications, from standard pressure uses found in construction and utility markets to more specialist high-pressure applications such as abrasive blasting, spray painting and optical fibre blowing.

Doosan 7/125-10/110

Bulroc’s recently opened facility in Chesterfield, Derbyshire

Bulroc boosts UK presence British down-the-hole (DTH) rock-drilling equipment manufacturer Bulroc has appointed Drill Store UK as its exclusive distributor for England and Wales.

Bulroc has been making DTH equipment for over 45 years and is based in a new facility in Chesterfield, Derbyshire. Established in 2007, Drill Store is a familyrun business also based in Derbyshire.

Bulroc managing director Jonathan Hurt said the tie-up would help increase market share in the UK. “We’ve aggressively expanded our brand in the export market for several years, to great success. Now it’s time to give more focus to the UK, our domestic market,” he added.

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NEWS people

Quarry Academy makes return Sandvik Construction, in conjunction with its partners, has developed the Quarry Academy, where industry specialists gather to share the latest thinking in quarrying through talks, seminars, quarry visits and workshops.

The programme is designed for the needs of the quarrying industry, with quarry managers, executives,

Learning at Quarry Academy

supervisors and owner/ operators all benefiting.

The Quarry Academy is a

three-day technical course that addresses best practices in quarry operations with a focus on systems integration, economic sustainability, process improvement, cost reduction and safety.

It not only addresses critical processes within the quarry, but also focuses on the relationship between processes, and how they can

Soilmec offers hands-on training

Two week-long seminars held recently in Edmonton, Alberta, Canada, gave operators a chance to increase their skills using Soilmec hydraulic drill rigs.

Soilmec-certified instructors came from Italy’s Foundations Technology Academy to teach the

participants state-of-the-art drilling techniques and help them grow professionally.

The training was organised by a collaboration of the Foundation Technology Academy (part of the Trevi Group), Champion Equipment Sales and the International Union of Operating

Engineers Local No955. A total of 40 students participated from three Alberta-based foundation contractors: AGRA Foundations, Keller Canada and Pacer Foundations Corporation. The seminars were held at the union’s facilities.

Steve Wilson from

be linked to improve overall operations.

Subjects covered include safety, drilling, blasting, fines and boulder management, load and haul, fleet management, crushing and screening, the quarrying process, quarry management and unit operation efficiency.

Sandvik’s next Quarry Academy is to be held in the Omni La Mansion hotel in San Antonio, Texas, US, on November 18-20.

Champion Equipment Sales, who helped organise and presented at the training, said: “Training is an essential element in the suite of services Soilmec provides its customers. Selling the equipment is the first step, but it’s also extremely important to make sure that the operators know how to run the machines properly.”

STEP UP TO THE FUTURE

sales@comacchio-industries.it www.comacchio-industries.it

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NEWS

Mursell is new Kier CEO Construction, services and property group Kier has named Haydn Mursell as its new chief executive.

With over two decades of industry experience and having worked at Kier over the last four years as group finance director, Mursell brings a wealth of market knowledge combined with a strong understanding of the group, to the role of chief executive.

Haydn Mursell

Before joining Kier, Haydn held senior roles at Balfour Beatty and Bovis Lend Lease. He replaces incumbent chief executive Paul Sheffield who announced in February that he was leaving the post.

Mursell commented: “Having had the opportunity to work at Kier over the last four years, it is a privilege to be taking on the role of chief executive.

“The business has some of the most experienced and skilled teams in the industry and a diverse portfolio of clients spanning the construction, services and property sectors, so it is incredibly well placed to make the most of recovering markets.”

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Skelair’s Steve lashley promoted Steve Lashley has been promoted to drilling and blasting operations manager at Skelair after 18 months as operations supervisor for its contract drilling and blasting division. In his new role for the UK-based ground-engineering and rock-drilling specialist, Lashley will have full operational responsibility for all drilling and blasting requirements.

Lashley joined Skelair in 2012 from Bam Ritchies, where he gained over 20 years’ experience across the range of quarry operations.

Since then he has received the Rexnord Award for the best result in the Quarry Blasting part of the Diploma in Quarry Technology.

John Mayo, managing director at Skelair, said: “Steve has been an asset to

Steve Lashley

the company over the last year and a half. He has used his industry-leading experience and knowledge to make a positive impact both commercially and operationally and his promotion is in recognition of this hard work.

“In his new role, Steve will prepare his division for a period of growth and development, in line with the wider company’s strategic plans.”

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Directional Drilling

calculating the cost Pricing is the ‘bottleneck’ in directional diamond-drilling applications, writes Shteryo Lyomov

D

Figure 1: borehole sidetracking

rilling is one of the methods used in mineral prospecting and exploration to provide subsurface geology information during the oredeposit search.

The core retrieved from the sampled prospective horizon, lode or strata is used for subsurface mapping and resource evaluation of the minerals of interest. Drilling strongly influences the success rate of exploration and the return on investment.

Boreholes drilled are vertical or inclined, straight or crooked.

Their deviation might be natural or manmade and depends on three main groups of factors related to geology, equipment and technology.

To reach certain targets, the borehole collar, inclination and directions are determined

Main reasons to use DDD • Reduces drilling programme volume; • Provides better-quality information; • Precise borehole navigation and target accuracy; • Requires smaller drill site for the exploration programme; • Reduces logistics problems; • Minimises environmental impact; • Resolves problems in difficult-to-access areas; and • Optimised project time and cost. during the process of planning.

In complex geotechnical conditions, reaching the targets might be a problem due to natural borehole deviation resulting from the aforementioned factors. This is a common problem for boreholes with depths of more than 450-500m.

In these cases directional diamond drilling (DDD) can be employed.

DDD applications Directional drilling is a widely used technology in the petroleum sector, but in mineral-ore prospecting and exploration it is still in its early stages. There are a few reasons for this, including misconceptions, the state of current technology, industry resources and cost.

DDD technology helps reach zones and specific targets within a predetermined accuracy (the safety envelope), and it has been proven that DDD reduces the drilling programme volume.

Previously published data shows a 41% saving in metres in a project where the depth of the boreholes ranges between 800m and 1,100m and the accuracy of reaching the target zones between 5m and 18m.

In some cases, project geologists expect results that are impossible to obtain.

Defining the DDD assignments and discussing the project goal with the directional-drilling specialist are crucial for project success.

A few directional-drilling companies offer consultancy and feasibility planning for DDD projects, both monobore and multilateral boreholes.

available technologies DDD technology can be applied using several methods (singlerun or continuous drilling), depending on the tools used – wedge, deflectors and continuous wedging tools, bottom hole assemblies (BHA), directional core barrels or bottomhole mud motors.

The best-known tool for DDD is the wedge or whipstock.

(Fig. 1 depicts borehole sidetracking – setting the wedge and drilling.)

There are two designs: permanent and retrievable wedges. Wedging is a simple method for deviating and steering the borehole. It is a single-run technology that might change the borehole angle on average by 2-3º.

This makes it convenient for avoiding borehole fish, or just to direct the borehole in an arbitrary direction, which is the niche of this technology application.

Deflectors are tools that allow ‘not controllable’ directional drilling (Fig. 2), meaning that the drill string is not oriented. In practice, the drill string is run in-hole and drilling is done in an arbitrary direction, unlike directional drilling where the direction and inclination of the borehole is controlled in order to reach a zone/target.

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Directional Drilling

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Figure 2: deflector tool

Deflectors offer restricted application since they are little known in the industry and there is a lack of experience in using them.

Compared with wedges and wedging, deflectors manifest several advantages – no reduction of borehole diameter; no metal left in the borehole; no cementing or extra runs for setting cement or a mechanical plug, when off-bottom deviation is needed; and cheaper in terms of multiuse of the tool.

The continuous wedging tool (shown in Fig. 3) is a mechanical device that provides controllable borehole steering. It combines the advantages of wedges and deflectors and allows deviation of the borehole up to 1º per metre. Its application is a cheaper alternative to the directional core barrels and downhole mud motors.

The core-barrel BHA with knuckle joint (shown in Fig. 4) has been developed and used mainly in the former Eastern Bloc countries. Its application is based on the theory of BHA, which is complex and makes its practical application difficult.

Since the first patent for a wireline directional core barrel issued in 1978, there have been several other designs with commercial applications coming from Scandinavia. The design of these tools is fairly complex, and maintenance and service require extra care.

Bottom-hole mud motors are mainly used in oil and gas drilling. Their application in orebody prospecting and exploration is restricted by several disadvantages, including drill string, mud pumps, borehole hydraulics and downhole

motor characteristics. All of these are based on the sizes of the boreholes and drill rig used in the drilling process.

resources anD potential Industry resources currently include companies offering DDD technology and technical personnel.

In fact, there are not too many companies offering DDD compared with conventional drilling contractors. The companies that do can provide specialised equipment and trained field operators.

They are usually experienced technicians or university-educated engineers. Lack of the latter is a problem, since DDD requires, along with maintenance engineering knowledge, planning, data analyses, evaluation and other skills.

Many attempts to use drillers have failed and show ineffective technology application. Personnel is an important part of DDD technology growth and stable market presence.

new pricing methoDology The cost of DDD has become the Achilles heel in the technology’s application in mineral-ore exploration. This originates in the fact that DDD is most often offered as a full service.

The cost of the project combines the cost of the conventional wireline drilling and the cost of DDD, which aggravates pricing. Difficulties arise from DDD technology specifics in terms of equipment, technology and manpower engaged and their impact on pricing.

When the wedging technology is used, the most popular pricing

approach is a fixed price per wedge. This is simple and easy when a single operation is planned.

However, in DDD operations, when the project assignment calls for considerable inclination and azimuthal angle change, this pricing approach is no longer appropriate.

The time to set the plug, install the wedge, drill and ream might vary depending on the borehole’s geotechnical conditions. This can have a significant impact on the cost.

A balanced, fixed cost based on analysis of gained experience after a short period is the most reasonable approach to costestimation issues.

The cost structure in the case of continuous drilling technologies (continuous wedging tools, directional core barrels and bottom-hole mud motors) is a bit more complex.

There are two main methods for cost calculations – daily/ monthly rate; and additional cost per metre including the deviated interval or the whole borehole length and the sum of the degrees of deviation drilling.

The former might include active operations, follow-up and stand-by, while the latter is a simple addition of metre cost of directional drilling.

Cost per metre of borehole is an easy pricing method; however, the DDD costs based on monthly performance might be problematic. For instance, a small volume of borehole deviation might require unreasonably high expenses.

Extra fees are added on top for spare parts, consumables and diamond products.

Pricing based on borehole

“The cost of DDD has become the Achilles heel in the technology’s application in mineralore exploration”

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Directional Drilling

Figure 3: continuous wedging tool

deviation is a new approach to pricing DDD. The cost structure presents the actual work done, in terms of the sum of borehole deviation expressed as a 3-D angle

(dogleg) in the borehole steering process.

The pricing methodology uses the following calculation model: 1. Calculation of 3-D angle The 3-D angle that results from

a single deviation cycle can be calculated with the equations of any surveying calculation method – average angle, minimum curvature, tangent, balanced tangent and radius of curvature or other. We suggest the following formula for the ‘Ith’ deviation cycle: α1=cos-1[cos(I1)cos(I2)+sin(I1)sin(I2) cos(A2-A1)], .... (1) Where: I1 = Inclination at first survey station; I2 = Inclination at second survey station; A1 = Azimuth at first survey station; A2 = Azimuth at second survey station.

2. Calculation of 3-D angle in the deviation interval This is the sum of the angles during the trajectory correction for the month. It might be the result of several deviation cycles. The following formula can be used: αsum=Σα1,……. (2) 3. Cost of directional diamond drilling The total cost of the directional diamond drilling is calculated by:

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CDDD=Ucαsum, ……. (3) Where: Uc = unit deviation cost, euros per degree; αsum = the sum of the 3-D angle.

It must be pointed out that the Uc depends on several factors such as a depth, rock type, natural deviation tendencies, DDD technology used and work conditions, among others.

It should also be considered that in long-term contracts the value of the unit deviation price could be lower; however, a minimum volume of the directional job should be provided.

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Directional Drilling

Those and other issues (mobilisation, spare parts and consumables, and transport) should be carefully considered in job pricing in order to correctly estimate the cost.

conclusions Broad application of DDD technology is restricted by the

Figure 4: corebarrel BHA with knuckle joint

factors discussed in this piece, and cost forms the ‘bottleneck’; often this is the result of misun-

Example of pricing based on borehole deviation In a borehole A-2 trajectory a correction has been made at the interval 1,181-1,183.5m.

The initial and final azimuth for the cycle run have been 320.7º and 328.8º, while inclination changes from -70.0º to -72.1º.

During the directional drilling cycle run, the azimuth and inclination angle changes

13

were 8.1º and 2.1º respectively; however, the 3-D angle change, calculated with equations 1 and 2, is 2.8º. If, for this example, we assume an average cost of €5,000/º (US$6,700/º), then cost of this operation would be €14,000.

In the cost estimation, the additional expenses should also be considered.

derstanding the technology specifics. The pricing methodology using the real borehole deviation is a novel approach that reflects the work done.

Using this approach might be helpful for directional-drilling companies as well as drilling contractors/mines.

The selection of appropriate technology, correct definition of the project assignments and building a project team (geologists and drilling engineers) to discuss different scenarios are the key to a successful DDD application and help avoid incorrect pricing.

“The pricing methodology using the real borehole deviation is a novel approach that reflects the work done”

Shteryo Lyomov is associate professor at the department of drilling and oil and gas production at the University of Mining and Geology in Sofia, Bulgaria

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28/01/2014 16:10

directional drilling

Furthering mine development BG Drilling Solutions (BGDS) has completed a directional drilling programme at the Serra Grande mine in Brazil

I

nfill drilling programmes are used to confirm the presence of mineralisation between step-out holes.

Anglo Gold Ashanti’s Serra Grande mine initiated a directional drilling programme in order to test the extent of the mineralisation found in two existing boreholes: II-425 (ca 850m) and XEIGD0002 (ca 600m).

The programme intended to confirm the presence of the sought-after mineralisation, which is expected to play an essential role for the further development of the mine.

The directional drilling project was completed by Bulgaria-based BG Drilling Solutions (BGDS); the project team consisted of drilling contractor Servitec Foraco and the local BGDS partner, Trust Soluções Geológicas.

The purpose of the drilling programme was to sidetrack the existing borehole and reach the orebody at target zones.

BGDS’s role was to conduct the sidetracking and control the deviation of each borehole in order to offset the new branch at 30m distance from the mother hole.

Planning After the mine geologist team had defined the drill targets, the various trajectory scenarios were discussed. In the planning process information about the type of rock formation, survey data, drill-rig capacity and technology were considered carefully.

It was decided that the depths of the kickoff points (KOP) were to be set in the interval from 380m to 400m for borehole XEIGD0002A and from 600m to 700m for II-425B. To reach the targets, tool face angles of 270º and 90º respectively were planned.

The borehole trajectories were set based on dogleg severity in the range of 12-15º per metre.

The technology chosen was a combination of directional cycles (short deviation in the range of 3-5m) alternating with conventional wireline drilling.

most suitable. Based on the project specifications, the CWTc NQ size was chosen. The main reasons for this were the shallow KOP depths and the diameters of boreholes II-425 and XEIGD0002.

For the job, BGDS mobilised two sets of CWTc (main and back-up) and two drilling engineers to cover both shifts.

The directional job in II-425B aimed to study natural deviation tendencies and find appropriate tool settings. The directional part of it was completed in 10 days.

Based on the experience from II-425B, the directional part of the job on XEIGD0002A was, in turn, executed in five days. Both boreholes reached the zones of interest. The selected equipment (CWTc) showed reliable performance and the planned borehole targets were reached.

The result of the successful application of modern directional drilling technology in an infill drilling programme can provide valuable information for further mine development.

15

BGDS drilling engineer running directional cycle with CWTc

Below: plan views of boreholes II-425B and XEIGD0002A Bottom: drilling on through the night

PreParation and execution The three versions of the continuous wedging tool – conventional (CWTc), self-orienting (CWTs) and wireline retrievable (CWTr) designs – in B and N size were evaluated in order to find the

This article was written by Grigor Topev, general manager at BG Drilling Solutions.

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Directional drilling project in process (Shell Oil Freeze Ring), using similar processes as at New Afton Mine

a slick solution Directional drilling was employed for a slickline project at the New Afton Mine in Kamloops, Canada

“The project was challenging due to the formation bedding, faulty ground and circulation problems, especially while pumping nearly 200 gallons per minute” IDS’ Accu-dril directional drilling mud motor

A

fter successfully completing a slickline job at New Gold’s New Afton Mine in 2010, Layne Christensen was requested to complete a more challenging slickline project at the same site last year.

In both cases, the slickline was needed at the mine to transfer cement from a batch plant to a staging area located underground.

“Slicklines are primarily used in mines to transfer cement or any material necessary such as gravel or backfill material,” explains Truman Langton, directional drilling manager for International Directional Services (IDS).

“The latest project was particularly challenging due to the formation bedding, faulty ground and circulation problems, especially while pumping nearly 200 gallons per minute to operate the motor,” he adds.

directional Pilot hole Layne’s team consisted of the Specialty Drilling Division and the IDS group – both part of Layne’s Minerals Services Group.

The objective of the project was to directionally drill with minimal deviation and hit a target approximately 2,000ft (609.6m) below the surface into one of the mine’s drifts.

Working as a team, the Specialty Drilling group provided the drilling services and IDS provided the directional drilling expertise and tooling.

Drilling began by advancing a 24in (61cm) Symmetrix system through the overburden and into competent bedrock. An 8in liner was temporarily installed through the Symmetrix system to aid in pilot-hole drilling operations.

Directional drilling was completed with a 4¾in fluid downhole motor using a nominal 6in tricone bit. The bottom hole assembly was steered with a National Oilwell Varco (NOV) Blackstar electromagnetic measurement-while-drilling (EM-MWD) tool.

Using what is known as performance drilling, the motor was steered by orienting it in the desired direction and sliding it without rotation for a predeter-

mined length. While sliding the motor, the balance of the bottom hole assembly was rotated at low rpm to maintain the borehole direction.

The directional pilot hole was terminated at a depth of 1,915ft.

This depth was selected since the formation above the mine roof was known to be fractured and a deeper pilot hole depth may have presented potential problems with the reaming operation.

lost circulation Following the pilot hole drilling process, a 6.5inx14.75in hole opener was advanced to 1,100ft.

At this depth, the rig encountered lost circulation and the boring was backfilled with cement. After allowing the cement to cure, the hole was successfully drilled to 1,925ft. The last reaming operation was to use a 14.75inx20in hole opener to the total depth of the boring.

While reaming the boring to 20in, lost circulation was encountered in the top 300ft of the boring. A plug was installed to 300ft, and the boring was backfilled with cement. This solution did not totally solve the lost-circulation issue.

A decision was then made to ream the upper portion of the hole and set another surface casing. This solution solved the lost circulation in the upper part of the hole.

Drilling resumed to 1,150ft where the previous deeper-hole

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lost-circulation zone was encountered. Layne then switched to the flooded reverse-circulation method and the boring was completed to 1,950ft.

Following drilling operations, 12.75in casing was welded and installed to this depth. The casing was then grouted in stages back to the surface.

“We oversized the borehole diameters to allow for additional surface casings to be added. This did prove useful as we encountered a formation in bedrock that needed to be cased off.

“Had we not oversized the borehole, then the additional surface-casing installation would have decreased the lower borehole diameter and potentially compromised the lowerborehole grouting operation,” says specialty drilling general manager Brian Dellett.

The final gyroscopic survey of the hole indicated that it was within 19.5in of the original centreline of the target.

Another view of the Accu-dril motor

What is IDS known for?

“Directional drilling and hole planning for close tolerance and multiple targets from a single master hole. In addition, IDS is known for precision borehole-deviation surveys using the latest technology available, including north-seeking gyros.

“IDS has also acquired

Colog, which specialises in geophysical and sophisticated hydrophysical borehole water-management investigations.

“IDS manufactures and sells its Accu-dril directional downhole motors worldwide,” says IDS general manager Greg Taylor.

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be reached by the more common mud motor.

With TDDT it is possible to drill straight holes (vertical, horizontal and sloped) or curved ‘banana’shaped holes to suit the needs of the designer. The hole probe is either permanently or intermittently connected to the surface, and it is possible to compare the actual path with the project path in real time.

A concrete cutoff wall was built to stop seepage below the Wolf Creek dam in Kentucky; this is the biggest use of TDDT so far

aPPlication

“Trevi developed methods to reduce the time required for surveying and drilling, adapting the techniques to geotechnical works”

Trevi introduced the use of directional drilling for a soilfreezing project for the Naples Metro, where the freezing pipes needed to be installed in 50m-long boreholes

adaptive technology In recent years directional-drilling technology has successfully been adapted to a variety of applications and conditions.

Here, Trevi discusses its directional-drilling system for the geotechnical field

T

revi Directional Drilling Technology (TDDT) is Trevi’s adapted system based on horizontal directional drilling (HDD) technologies, which are usually used to lay utilities under surface obstacles. In turn, much of the technological equipment adopted in this sector stems from the oil industry.

In order to make the system faster (and so more costeffective), Trevi developed methods to reduce the time required for surveying and drilling, adapting the techniques to geotechnical works.

As the downhole probe has to be connected to the surface by an electric wire, Trevi developed three different methods for diverse conditions: special rods with internal ‘fast connectors’ were manufactured for horizontal medium-distance boreholes; a special wire cartridge has been designed in order to contain the whole wire length in horizontal long-distance boreholes; and a patented wireline system has been conceived for vertical boreholes.

For TDDT, drilling rigs need to

be modified to fit the wire winch for the signal.

Electronic equipment for survey consists in some devices of directional down-the-hole instruments, a surface computer and wire power supply.

Drilling tools can vary in function depending on the formations to be drilled, from tricone bit and mud motor to down-the-hole hammer.

In soft ground conditions, the choice of tools is relatively simple and largely the same as for HDD. For hard-rock conditions, Trevi has introduced tools not commonly used in the directional drilling field; in particular, the Trevi steered down-the-hole hammers (air or water-driven) that can achieve high accuracy and productivity results, which cannot

TDDT has been used for soil freezing, grouting, to connect drainage wells, for containment of polluted areas, to guide large-diameter piles or hydromill panels, for compensation grouting, for both vertical and horizontal coring, and high-precision anchors.

In the last five years considerable effort has been put into the confinement of contaminated areas through vertical and horizontal barriers.

Trevi introduced the use of directional drilling at the beginning of the last decade for a soil-freezing project for the Naples Metro, where the freezing pipes needed to be installed in 50m-long boreholes.

The selection of directional drilling was dictated by the need to install the freezing pipes with an accuracy of a few centimetres.

The holes were drilled starting from shafts as deep as 40m, with a water counterpressure up to 30m. The depth, the congested milieu, the presence of vehicle traffic and of the railway line were an added challenge to the guidance system.

In order to overcome the problem, after many tests, a new method making use of a microcoil was invented and successfully used throughout the rest of the project.

The biggest project to use TDDT to date is the Wolf Creek Dam in Kentucky, US, where small-diameter smart holes were used to guide 1,200 secant piles for a cut-off wall, to a depth of 84m.

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A similar, smaller project was successfully completed in Arapuni, New Zealand, for the construction of four cut-off walls of continuous secant piles.

case study In Manfredonia, southern Italy, Trevi proposed and realised a combined barrier to confine a waste area that was identified as a source of contaminants. The operations were concluded in a record time of eight months, in which 57,000m of directional drilling was performed, in conjunction with vertical holes to seal a perimeter of 1,350m total length.

The project designers selected a very innovative solution foreseeing that the impervious bottom slab should be created by grouting the rock underneath the volume of the waste (as found by soil investigation) by means of a double layer of sub-horizontal curved directional drillings.

The perimeters of the area were contained in the same way by installing a cut-off wall with a triple row of sub-vertical holes.

The works started in 2010, and involved several rigs and plants to cope with a tight schedule.

The bottom slabs of the two areas needed to be formed by a total of 565 holes, equal to 58,380 linear metres. The average length should be 103m with a maximum of 150m.

The holes were drilled using a surface magnetic guidance method. The system makes it possible to calculate the position of the drilling tool by creating artificial magnetic fields at the surface. The strength and direction of the generated field are detected by the instrumentation equipping the drill string, and transmitted in real time to the steering engineer.

Every individual hole is planned in advance, and the spatial co-ordinates of the various surveys are compared with the theoretical position to decide the need of a correction. The accuracy requested was plus/ minus 30cm.

Due to the extremely high grade of fracturation of the rock, a downstage grouting method was required in some zones. The holes were drilled until the circulation of the holes could be efficiently maintained.

As soon as flushing of the cuttings could not be achieved, the hole was stopped and grouted. After hardening, the hole was re-drilled.

The procedure was repeated until reaching the design length.

Special expansive cement mixtures were used to prevent over-grouting due to the highly permeable rock, and the possibility that the grout by-passes into the waste mass.

The first stage of rough injection was followed by a second stage intended to improve the waterproofing of the main fissures and to treat the smallest ones.

To this purpose a MPSP (Multiple Packer Sleeved Pipe System) formed of 2in (5.1cm) steel tubes was inserted in the

19

TDDT was used in Arapuni, New Zealand, for the construction of four cut-off walls of continuous secant piles

boreholes and grouted with high-penetration cement and silica mixes.

The result obtained was checked with both a permeability test (Lugeon test) and borehole camera inspections. The work at Manfredonia was completed by the conclusion of 2010.

Left and below left: at Manfredonia in Italy, Trevi carried out 57,000m of directional drilling to seal off a contaminated area

How TDDT can improve penetration of the ground when rehabilitating contaminated zones underground

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directional drilling

stringent specifications.

In early June 2014 Drillcon mobilised a Sandvik D-140 rig and crew, while Devico arrived with its DeviDrill directional core barrel, borehole survey tools and technical crew. The DeviDrill is a wireline barrel on which the offset angle can be seamlessly adjusted, making it possible to adapt to various geological formations and requirements to rate of deflection.

hole accuracy

a new direction for nuclear waste A combination of standard wireline drilling and directional core drilling was successfully utilised on a test programme for nuclear-waste storage The SKB test facility is a highly accurately surveyed surface pipeline that is used to check the precision of both magnetic and nonmagnetic borehole survey tools and surveying procedures

C

ore drill horizontally, at 2º inclination, for 100m, with a maximum deviation of just 0.67% from the centre line and a maximum curvature change rate of 0.1º per metre – these were the requirements set by Svensk Kärnbränslehantering (SKB), the Swedish Nuclear Fuel and Waste Management Company, and Posiva, a Finnish nuclear-waste management company, for their test programme for horizontal storage of nuclear waste.

The storage method called KBS-3H (horizontal) is being jointly researched by SKB and Posiva as an alternative to their reference design KBS-3V (vertical). It involves placing canisters of waste material in 300m-long horizontal drifts 400-500m below surface.

The tests were carried out in SKB’s research facility, Äspö HRL, in Oskarshamn, Sweden.

constructing driFts The suggested technique for construction of the drifts is to core a 76mm (N-size) pilot hole, and later ream it to full size, 1.85m. Experience from previous drilling in the area had shown that the tight requirements would be difficult to achieve with standard wireline core drilling alone.

To best ensure that the hole would stay within the tolerances, a combination of standard wireline drilling and directional core drilling was deemed necessary. Swedish contractor Drillcon Core was hired to drill the hole and Devico Sweden, branch office of directional core-drilling specialist Devico, to provide the directional equipment and expertise.

The same contractors had completed a similar hole for SKB six months earlier to test the methodologies, though with less

Much of the success of a highaccuracy hole is determined already when drilling and installing the casing; in this case SKB had opted to do it beforehand using smaller drilling equipment.

Much effort was also put into measuring the drill-rig alignment.

Normal underground mine-surveying techniques were used, and the measurements were repeated several times while the rig was being set in place.

Drilling was started with special care taken to prevent any displacement as the bit first touched the rock formation.

A borehole is only as accurate as the survey tool, and to make sure that high-precision tools were being used, a thorough test was performed on a variety of tools in SKB’s test facility before the project started.

To further reduce the risk of measurement error, it was decided to log the hole not with one tool but with a selection of tools that had proven accurate.

Two tools supplied by Devico, the DeviShot magnetic tool and the DeviFlex strain-gauge-based non-magnetic tool, were used along with a non-magnetic rate gyro system. Once at 50m depth, a laser was also pushed into the hole to visually confirm the straightness of the hole.

With a normal wireline core barrel, it is common to experience a steady deviation caused by drilling parameters, equipment wear and/or geological formation.

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The inclination over the first 65m was controlled by adjusting the core-barrel assembly and later by directional core drilling. The casing’s actual alignment, 2.18º, is presented as baseline here. In azimuth, the hole had a trend to the left that was corrected with directional core drilling towards the end, bringing the hole path close to target

This article was written by Rune Lindhjem, project manager at Devico, and presents initial data; SKB will publish detailed results at a later stage. More information about the directional core drilling technology and the KBS-3H storage method is available at www.devico.com and www.skb.se, respectively.

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After 65m of drilling, the hole had been surveyed approximately 25 times and kept straight by controlled drilling parameters and adjustment of the specially assembled core barrel.

However, due to altered geology and increased natural deviation, the hole had started experiencing deviation to the right, which made it necessary to do a short section of directional core drilling.

The DeviDrill directional core barrel was prepared with a low offset angle to keep the dogleg within 0.1 degree per metre and fitted in front of the N-size drill string.

At the bottom of the hole the DeviDrill was oriented using the gravity tool face data from the on-board survey tool, and a run of 1.2m was completed. The effect of the directional drilling was as expected, with the hole turning left, along with a slight upward lift.

To improve the accuracy of the hole further, a second short 1.2m correction was initiated at 73m depth. As the inclination required no further adjustment, the orientation was adjusted

length the hole had a variation in inclination of 0.25º and 0.4º in azimuth, and a deviation of 2cm to the right and 4cm up at the end of hole.

The maximum curvature change rate occurred during the last directional section, measuring approximately 0.08º for one metre, being well within the required limits.

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directional drilling

accordingly compared with the previous run. This resulted in a smooth left turn pointing the hole directly to target.

Two weeks after it had started, the project was finished on schedule, having consisted of 94m of core drilling, 45 directional surveys and two directional corrections. The final survey indicated that over its full

RESEARCH

To reduce the effects of these parameters and make drilling more controllable, the Devico technicians assembled an especially stable core barrel using shorter outer tube sections and multiple reamers and stabilisers with various sizes and degrees of wear.

The result was a stiffer core barrel less likely to be affected by the geological formation, while the position and the wear of the reamers gave a mild ‘point-the-bit’ effect.

Adjustment of the position and sequence of the reamers, combined with carefully monitored drilling parameters and frequent surveys, would then give some directional control over the borehole on both the vertical and horizontal planes.

21

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auStralaSia

uncovering new potential Geoscience Australia and the DET CRC are undertaking stratigraphic drilling and deploying new mineralexploration technologies The Boart Longyear UDR 650 diamond drill rig on site in the Stavely Zone of western Victoria

“Australia’s share of global mineral exploration expenditure has dropped from 20% in the 1990s to around 12% in 2013”

G

eoscience Australia, Australia’s national geological survey, and the Deep Exploration Technologies Co-operative Research Centre (DET CRC) have started a regional stratigraphic drilling programme to reveal the hidden mineral potential of Australia’s buried but prospective geology.

The drilling programme is also deploying DET CRC’s transformational new technologies for mineral exploration through the cover rocks obscuring prospective geology.

Australia’s share of global mineral exploration expenditure has dropped from 20% in the 1990s to around 12% in 2013.

This decline has paralleled a decline in discovery of new major mineral deposits over the same period both in Australia and worldwide.

Decreasing mineral exploration success and expenditure in Australia reflects the fact that relatively easy-to-find mineral deposits with a surface expression have largely been discovered.

New mineral provinces must be found hidden beneath barren cover rocks, and new mineralexploration technologies are needed to search more efficiently and effectively beneath them.

Collaboration Geoscience Australia is collaborating with the Geological Survey of Victoria within the drilling programme to test a new

geological interpretation of the Stavely Zone of western Victoria and seeking the key geological indicators of potential new mineral provinces hosting metals such as gold, copper, nickel and other base metals.

DET CRC is managing the drilling programme on behalf of Geoscience Australia and the Geological Survey of Victoria.

DET CRC will combine conventional diamond drilling, with, for the first-time, new real-time sensing technologies, both downhole and top-of-hole.

Such new technologies are intended to inform drilling decisions and, in due course, to replace time-consuming and expensive lab-based assays of drilling samples.

“This collaboration provides an opportunity to field test and ‘pull through’ the new technologies that will be required to explore the 80% of the Australian continent where mineral deposits are hidden beneath barren cover.

“It is also a great example of different organisations collaborating under the ‘UNCOVER’ mineral exploration strategy of the Australian Academy of

Science,” explains Richard Hillis, the chief executive officer of DET CRC. “Our goal is to provide precompetitive data on the mineral potential of unexplored areas of Australia where prospective rocks are obscured by barren cover,” says Dr James Johnson, chief of Geoscience Australia’s resources division.

“Drilling provides a critical source of information to confirm the nature of concealed geology, which reduces the technical risk to mineral explorers.

“Through this collaboration we will not only undertake this advanced drilling, but also help develop the new technologies that are required for cost-effective and successful mineral exploration through cover, thereby assisting exploration in all covered areas of the Australian continent.”

SoniC and diamond drilling DET CRC has contracted Boart Longyear to undertake the drilling using the LS600 sonic rig and UDR 650 diamond rig. Sonic drilling produces less than 1% drill deviation and provides a continuous, relatively undis-

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auStralaSia

turbed core sample of unparalleled quality and accuracy through any type of formation.

Sonic drilling reduces waste by up to 80% relative to conventional methods, reducing the expensive disposal of waste.

In this programme sonic drilling was primarily selected to drill ‘pre-collars’ to the top of the basement through unconsolidated cover (‘running sands’).

Sonic drilling has encountered running sands, volcanic-rich conglomerates, clays and aquifers during the programme, through all of which it has had excellent reliability and sample recovery.

The UDR 650 diamond rig is being used to drill both full diamond holes and diamond ‘tails’ to the sonic ‘pre-collars’.

In addition to the core sample recovered, rock powders produced by the UDR 650 are being logged by DET CRC’s prototype Lab-at-Rig system, thus providing near real-time geochemistry and mineralogy, and the holes are being geo-

VIBRO-ROTARY HEADS

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physically logged by DET CRC’s AutoSonde.

lab-at-rig In collaboration with partners CSIRO (the Commonwealth Scientific and Industrial Research Organisation), Imdex and Olympus, DET CRC has deployed the Lab-at-Rig XRF & XRD technology. This is a trailer-mounted concept system that is able to provide near real-time geochemistry and mineralogy during the drilling programme.

The system is being used to test the workflows for top-ofhole analytical systems and integrated data infrastructure that will feed important learnings into the engineering of the final Lab-at-Rig solution.

This testing project uses Reflex Connect and Terra portable analyser technology, coupled sampling workflows and data management through the

“In the near future, having petrophysical log data with a drill hole will be as natural as having a mobile phone in your pocket.

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Right: DET CRC researchers testing the AutoSonde on site

Below: composite geochemistry and mineralogy produced by the Lab-at-Rig for the Stavely 02 hole plotted alongside geologist’s logging data and hand-held magnetic susceptibility data

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Reflex HUB, all deployed in a mobile unit.

Data is delivered to Geoscience Australia geologists during drilling, giving important early information about the location of key geological horizons before conventional geological logging of the core.

“It was exciting to be able to log in to the Reflex HUB from Perth and see that the drill rig in

Victoria had crossed a critical boundary,” says DET CRC project leader James Cleverley.

The Lab-at-Rig team will use the learnings from this concept testing to further refine the prototype Lab-at-Rig development.

autoSonde In collaboration with partners Globaltech and Curtin Univer-

sity, DET CRC has also deployed its AutoSonde to acquire gamma logs of the holes.

The AutoSonde is pumped or lowered inside the drill rods by the driller on the completion of drilling with the purpose of logging the hole while the rods are being pulled out of it.

The AutoSonde is a robust platform into which a range of geophysical sensors can be mounted to provide similar information to conventional wireline logging, only without the costs, inconvenience and risk associated with separate conventional wireline logging.

It reduces the costs of recovering geophysical logging information, returns logging results to the explorer as soon as the hole is completed and largely negates risk associated with hole collapse prior to or during logging.

Once drilled, the gamma data can be immediately compared with the core to identify major lithological boundaries in each hole. Two types of logs were recorded, wireline gamma and rod-pull gamma to validate the AutoSonde as a truly autonomous instrument.

Tests were then undertaken to analyse data integrity for various hoist speeds.

“In the near future, having petrophysical log data with a drill hole will be as natural as having a mobile phone in your pocket. People will wonder how we ever explored without it,” says DET CRC project leader Anton Kepic.

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a stronger Christchurch Construction companies continue to rebuild earthquake-damaged areas of Christchurch, New Zealand

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hristchurch-based McMillan Drilling was contracted by Fulton Hogan, a civil contracting and construction company operating throughout New Zealand, to install foundations, and perform ground improvement and dewatering for a replacement sewerage pumping station.

The drilling company was working as part of the SCIRT (Stronger Christchurch Infrastructure Rebuild Team) alliance to restore much of Christchurch’s horizontal infrastructure following the February 22, 2011, earthquake and subsequent aftershocks.

The original pumping station suffered major damage in the earthquakes, and the decision was made to build a replacement facility. When completed, the new pumping station will deal with one-third of the city of Christchurch’s sewerage waste.

Two views of the B125 piling rig being lifted and lowered into the shaft, 10m below original ground level. The lift was conducted using a 450t mobile crane

three StageS McMillan Drilling had its work broken into three major stages.

The initial stage involved devising a suitable dewatering system to lower the groundwater table by 9m. The normal groundwater level is 1.5m below ground level, and the proposed

sheet-piled shaft needed to be dewatered to 10.5m below ground level to allow dry working conditions.

Rebuilding infrastructure SCIRT’s role is to repair the publicly owned, earthquakedamaged pipes, roads and bridges in Christchurch by the end of 2016.

Its work is laying the new foundations for the city, allowing the vertical rebuild to take place.

Rebuilding this infrastructure is likely to cost around NZ$2 billion (US$1.73 billion).

SCRIT is rebuilding the same level of infrastructure service that existed before the earthquakes, and wherever possible, improving the standard with modern materials and designs.

In most cases, the alliance improves structural strength, so that it can stand up better if there are severe earthquakes in the future.

The ground conditions consisted of fine and silty sands to depths of 25m and more, and the dewatering discharge had to be pumped 800m away to the nearest suitable discharge location.

Ten wells were added to 18m depth, and submersible pumps were installed. These were linked via a ring main to a settlement tank with an oil-water separator, which fed into a second tank with an automatically controlled booster pump to send the water to the discharge location.

The second stage of works involved the installation of 260 continuous flight auger (CFA)

“All the works for the project were conducted using a single Casagrande B125 piling rig in CFA configuration”

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“The piling rig was lowered 10m into the shaft, with less than 0.5m clearance across the diagonal to the intermediate waler beams”

The B125 in position, installing the secant wall. The concrete pump and trucks are above ground, and the skip for spoil removal is being lowered into the shaft after emptying.

A concrete slab with guide wall was installed before the rig was put in place

ground-improvement piles to mitigate liquefaction around the pump-station perimeter and under the new pipes feeding into and away from the new pump station.

The piles were 600mm in diameter, ranging between 6m and 13m in depth, and were installed from the existing ground level.

The final stage of foundations involved the installation of a hard/intermediate secant-pile wall formed in the shape of a square with a cross through the centre to create an interlocking cell structure for liquefaction mitigation directly underneath the base of the new pumping station.

The 132 secant piles required accurate interlock, and were of 600mm diameter and 6m long.

To ensure good pile interlock, the decision was made to install the secant piles at the base of the new shaft.

The piling rig was lowered 10m into the shaft, with less than 0.5m clearance across the diagonal to the intermediate waler beams. Piles were installed in a 16mx16m working space through a pre-installed guide wall poured onto the shaft base.

All the works for the project were conducted using a single Casagrande B125 piling rig in CFA configuration. The foundation contract was completed successfully in the required timeframe.

dual-rotary innovation Australian drilling and well-servicing company Easternwell has introduced threaded casing to its dual-rotary operations

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or Easternwell, using the dual-rotary method provides a significant benefit to clients and contractors as the predictability of penetration rates in known formations translates into accurate project cost estimates, which provides both users a distinct advantage when calculating project costs.

The company identified that although penetration rates were predictable, the remaining element of welding casing together during the drilling process not only took a large proportion of the drilling time but was also unpredictable and had inherent safety issues associated with hot works, such as welding and profile cutting.

As a result, Easternwell introduced threaded casing to its dual-rotary operations at Fortescue Metals Group’s (FMG) Cloudbreak project in the Pilbara, Western Australia, in 2012 – specifically, the use of threaded 18in (45.7cm) casing.

threaded CaSing Threaded steel is commonly used in the oil and gas industry.

As dual-rotary drilling requires thick steel walls, Easternwell benefited from knowledge cross-over from its energy business and designed threaded ends to be cut into the steel casing.

According to the company, this innovation had immediate benefits. Utilisation of threaded casing enables an increase in production of up to 30% by eliminating the need to weld casing altogether. For example, joining each 18in length of casing now takes less than five minutes, compared with 45 minutes if welded.

From a safety perspective, moving to threaded casing removes the need for hot works.

From a quality perspective, using threaded casing also results in casing lengths being straight and aligned.

In addition to cost savings received due to an increase in productivity, casing is not charged to the client as it is now considered part of the drill string.

Easternwell’s general manager of minerals, Sheldon Burt, says

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Above: using threaded casing instead of welding makes the job much easier and quicker for operatives Main picture: dual-rotary drilling with threaded casing proved its worth in the Pilbara

HEM560 EXCAVATOR DRILL

that as a result of the threaded ends cut into the steel casing, Easternwell was able to significantly reduce the critical path in the drilling process.

Specifically, in just six months the team was able to complete a total of 66 production bores (18in drilled to 100m) and 31 monitoring bores (7in drilled to 100m).

“This is a testament to the increase in production attributable to the use of threaded casing that significantly reduces the critical path in the drilling process.

“This was completed by two dual rotary rigs with a weighted average of 5.5 production and 2.5 monitoring bores per rig per month,” says Burt.

The truck-mounted dual-rotary rig with equipment stowed for travel

Gregory van Blomestgein, FMG specialist drilling hydrogeologist, thinks that the introduction of the threaded casing on the Cloudbreak project was a great idea.

“From a hydro, cost-saving and safety perspective, I can’t see why anyone else wouldn’t use it. I am in the process of working with our other drill contractors to have this introduced across all our projects,” van Blomestgein says.

About Easternwell Easternwell operates under longterm contracts with some of Australia’s largest resource companies.

With over 1,200 employees and 60 rigs, it is a subsidiary of the publicly listed Transfield Services, an integrated services provider to Australia’s resources, energy, industrial, infrastructure, property and defence sectors.

Easternwell’s Minerals Group (including Gorey Cole Drillers) provides a variety of services, including dual-rotary, horizontal drilling, wireline diamond coring, reverse-circulation drilling and conventional air/mud rotary drilling.

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drilling deep for gold and copper Indodrill recently undertook deep diamond-drilling programmes for two clients in the Aceh region of Indonesia

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Below: an ID 1800 heliportable rig working on Barisan Gold’s exploration project in Aceh province, Indonesia Bottom: an ID 1800 trackmounted diamond drill rig at the Beutong site in Aceh

he objective of Tigers Realm Metals’ Beutong and Barisan Gold’s exploration projects is to target the deepest levels of the coppergold-moly porphyry system in the northern part of the island of Sumatra in Indonesia.

exploration Singapore-headquartered drilling contractor Indodrill operated an ID 1800 trackmounted diamond drill rig, with the capacity to drill 700m deep in PQ size, 1,300m in HQ and 1,800m in NQ, on a two-hole deep drilling programme for the Beutong project, which is located approximately 180km southeast of Banda Aceh, the

capital of Aceh province.

The rig achieved a 700m depth in PQ, which Indodrill believes to be an industry record in the region, and then continued in HQ size to 1,300m and 1,592m in NQ, in extremely challenging drilling conditions. In the end, the hole was completed successfully to the client’s target depth.

While drilling this particular hole to the completion depth in NQ size, the production rates at the deepest levels still exceeded 30m per day.

Further funding for the project is currently being pursued, and the licence is being converted from exploration to production status, while drilling has been suspended temporarily.

An ID 1800 heli-portable drill rig has, in turn, been contracted

by Barisan Gold in Aceh province. The machine was chosen due to the area’s topographical challenges, affording only limited access to the site, and the ability to break it down into parts that can be easily transported by helicopter.

This model of rig offers the same depth capacity and specifications as the trackmounted version and can be moved with an excavator if required. For this particular project, the rig achieved 500m in PQ, 1,150m in HQ and 1,465m in NQ. The Barisan contract is still ongoing with two drills operating on a 24-hour shift rotation.

SpeCialiStS on Site Indodrill provided drilling and contracting packages for both deep-hole drilling programmes,

which included, but were not limited to, the drilling rigs, crews, parts and equipment, logistical support and mud engineering specialists.

“The projects were run under the control of our deep-hole drilling specialists who have many years’ experience and who were able to troubleshoot, advise and come up with solutions when difficult conditions were encountered in-hole,” says Indodrill Group’s managing director, John Horne.

Due to the difficult conditions, which included broken and fractured ground formations and in some areas very soft sandy zones, the holes were kept on target with the help of directional drilling techniques, which included the use of in-hole cementing and then wedging, plus downhole motors that were utilised to keep the hole on target to the client’s satisfaction.

Delivery of any required spare parts and equipment required on-site was arranged and organised through Indodrill’s

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Main picture: Indodrill rig on location in Indonesia for Barisan Gold exploration drilling Near left: Indodrill’s rig achieved a 700m depth in PQ size for the Beutong project

logistics department based at the Bogor main office in Sentul City near Jakarta, Indonesia.

Key iSSueS During the drilling of these holes, the drill crews paid close

attention to core recovery, cleanliness, core marking, handling of core samples and daily documentation of the drilling progress, offering full drilled-hole information in real time.

As with all drilling programmes the world over, there are key issues that both mining and exploration companies focus on, including safety, production rates, quality of service, time management, drill-rig capabilities and availability, access to equipment and parts, and co-operation between both contractor’s and client’s personnel.

In order to achieve the above, Indodrill worked closely with the clients’ geologists to reach the projects’ objectives.

“The rig achieved a 700m depth in PQ, which Indodrill believes to be an industry record in the region”

Expansion and improvement Indodrill Group’s biggest market to date has been in the Asia-Pacific region, mostly drilling for gold and copper, but not limited to these commodities, as it also drills for lead, zinc base metals and coal, among others.

The group recently announced its expansion into the Europe, Middle East and Africa (EMEA) region through a joint-venture partnership with the Mulraney Group that operates Scotland-based GeoSonic Drilling.

Indodrill’s expansion will offer clients in EMEA countries the know-how of a company with over 20 years of drilling

experience in the Asia-Pacific region.

“In the last two years, the mining industry has struggled in this region and worldwide, affecting mining and service companies associated with the industry,” explains John Horne. “The drilling sector has been hit exceptionally hard with companies struggling to survive under the current market conditions.

“There has been a very slight improvement in the last few months, but we hope for a noticeable improvement in the second half of 2014, and moving into 2015 we should witness considerable improve-

ments in the commodities market, which in turn means mining and junior exploration companies will start exploring again and start drilling programmes on a larger scale.”

In the coming months, Indodrill will finish work on an improved heli-portable drill rig with a depth capacity up to NQ 2,200m.

“We believe it will be the deepest available rig of this type on the market. This will then give clients access to an even greater range of depths with heli-portable rigs for remote locations,” adds Horne.

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24/07/2014 10:50

CONSTRUCTION DRILLING

thinking on your feet Keller Canada finds a fast solution for a structural failure at the Colonsay potash mine

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hen the roof of a thickener tank unexpectedly collapsed at a Mosaic potash mine 75km southeast of Saskatoon, Saskatchewan, it required immediate repair to ensure the impact on mine productivity and cost was minimised. Since the tank was integral to processing potash, the client needed a piling contractor to move quickly to begin work on its new foundation.

Mosaic’s proposed deadline was to have the new foundation and subsequent work, including walls and roof, completed before the freezing temperatures hit five months later – a time frame that demanded immediate action.

When Keller Canada was awarded the piling and shoring work for the foundation, it faced a number of challenges in order to begin the repair under a tight timeline. The company learned that combining hands-on experience and procuring unique equipment was essential to finding the right solution.

ImprovIsed plannIng Once Keller Canada arrived on site, the main challenge was that the tank was older and required

careful attention to ensure it remained structurally sound.

Jordan Moi, project manager for the Northern Saskatchewan region, describes the tank’s conditions: “The tank was very old and was believed to present risk of further structural failures when the perimeter berm was to be removed.

“Since the removal of the berm was required to install the piles and complete the forming of the new wall, a solution was required to hold back the compromised tank holding fluid. We had to put sheet piles around the perimeter to provide support for when the berm was removed. The fact that the tank’s structure was already compromised made the job of drilling new piles around it even more complicated and added scope to an already critical deadline.”

Due to the sudden roof collapse and the urgency of its repair, Keller Canada had one week and limited information to plan a strategy and begin work.

Despite roadblocks, the company was confident enough to execute a plan that involved renting equipment its operators were not familiar with in order to complete

the work. Part of this strategy was to search throughout North America for the right equipment for the space constraints and sudden elevation changes surrounding the tank – a plan that proved to be challenging.

31

Above, left to right: the Bayshore LoDrill DH30 reached locations that conventional track-mounted drill rigs could not; installing sheet piles to maintain the tank’s structure

sourcIng the solutIon Once Keller Canada planned its work and identified the equipment required to complete the foundation repair job, it reached out to its network of vendors, colleagues and friends to source the equipment. The company was sure its staff could meet the deadline, as long as they had the right equipment to work with.

Moi explains Keller’s approach: “The job had a tight timeline and was a high risk to our client if the work was not completed safely and efficiently. Although Keller

Experience piling up Formerly North American Caisson, a division of North American Construction, Keller Canada was acquired by UK-based company Keller in 2013, though its management and operations remain the same. With 30 years’ experience piling Canadian soil, Keller Canada operates in seven regions across the country.

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CONSTRUCTION DRILLING

Left to right: utilising Keller Canada’s conventional track-mounted equipment in areas that presented less space restriction; it was an added challenge to bring in equipment Keller Canada had never used before

Canada didn’t own the right equipment for the job, we still offered our services and managed to source the equipment on a temporary basis from the US.” The equipment required was not readily available in Canada.

However, a Bay Shore LoDril DH30 from Idaho and a vibro hammer mounted on an excavator from Indiana were found and immediately sent to the job site. It was an added challenge to bring in equipment Keller Canada had never before operated.

“A Bay Shore LoDril DH30 from Idaho and a vibro hammer mounted on an excavator from Indiana were immediately learnIng experIence sent to the After working around the clock in job site” areas of limited access, Keller Canada completed the project in

about six weeks – a job that would usually take twice as long to complete. Though a number of factors worked together in Keller’s favour, Moi cites the experience and knowledge of its team as being integral to successful completion of the project.

“I’m most proud of our crews that completed the work safely and efficiently – they made it happen,” Moi says. “We also sourced our most talented operators across Canada to ensure our success. Over half of the workforce on the project was supplemented by labourers and equipment operators from our Regina and Toronto locations.”

According to Moi, the company’s experience at the Colonsay potash mine will help Keller Canada be better prepared for similar challenges in the future.

“When you’re drilling deep into the ground, you can never be 100% certain what the requirements will be. Because of this, we anticipate challenges on every job. When things don’t go according to plan, you find solutions to fix it – securing rare or unknown equipment, accelerating schedules, redesigning and retaining the top talent are all part of the solutions that make working in the piling industry so interesting,” he adds.

Reprinted from Piling Industry Canada

up to the challenge Fraste has boosted its foundation rig range with a flexible and dynamic unit – the newly designed MITO 60

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he latest version of the company’s MITO 60 drilling rig is available for micropiling and reinforced concrete work.

According to the Italian manufacturer, it ensures quality and reliability under any drilling situation, thanks to features such as an efficient hydraulic system to drive all rig functions, low-noise 129kW power unit, radio remote

control for all drilling functions and a new drill-pipes drum that allows pipe loading in a fully automatic mode.

In this way the driller is not physically involved with the hazardous pipe handling operations, and it ensures safety during all working stages and a reduction in unproductive time.

The oscillating crawler carrier gives the MITO 60 stability while

The MITO 60

moving on the drilling site, and the rig’s manoeuvrability adds to its safety and adaptability.

There are several different versions of the rig available that offer the operator a larger drilling spectrum – also for coring and traditional drilling.

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constructIon drIllIng

compact power

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The MC 5 D

Hydraulic drill rig manufacturer Comacchio has launched two foundation rig models

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he MC 5 D and the MC 6 are the newest additions to Comacchio’s MC line of products for foundation drilling.

The MC 5 D is a compact high-torque hydraulic rig with remote power pack, which was specially designed for the execution of ground engineering works in confined or low overhead spaces and difficult access job sites, including inside buildings, basements, small tunnels and similar locations.

This is possible due to the rig’s wide range of allowable movements, in addition to the telescopic mast, which is available as an option. Depending on the job site, the machine can be supplied with a soundproof diesel

power pack or with an electric drive power pack. In its High Tech Line version the machine features a Deutz new generation engine complying with the Stage 3B/Tier IV Interim emission standards and delivering 115kW power.

The MC 6 was developed to meet the increasing demand of drill rigs that combine compact size and high performance. With 6,000/6,500kg weight, the MC 6 accommodates an 85 kW Deutz engine in line with the Stage 3B/ Tier IV Interim emission standards. Due to the particularly powerful engine for this weight category, combined with the machine’s advanced modular hydraulic circuits, the rig can

achieve remarkably high performance standards, says Comacchio.

Both MC 5 D and MC 6 can accommodate a wide range of rotary heads, hydraulic drifters and accessories, which make them suitable for any type of rotary or rotary-percussive drilling. To improve operator safety and productivity, both machines can be equipped with the Comacchio radio control system, which manages all the machine functions.

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Auger drilling

Installation of cyclonic tie-down foundations

“The combination of the machine and attachment created an industryfirst tracked loader with 25,000Nm of torque�

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Torque down under

Earthmoving attachment manufacturer Auger Torque has been creating custom solutions and taking its expertise to the work site for its Australian customers

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ilewest, a supplier and installer of steel screwpiles, approached Auger Torque last year to procure a drive for a foundation project that it was working on in the Pilbara region of Western Australia.

Reliability, high performance and the flexibility to be able to

work in anything from soft ground, sand and clay, to solid rock, were given as the key factors that would determine which Earth Drill from Auger Torque would be judged up to the task.

The Takeuchi TL 12 high-flow loader used by Pilewest had enough power to run the Auger

25/07/2014 10:39

Auger drilling

Torque Earth Drill 25,000Max attachment, and the combination of the two created an industry-first tracked loader with 25,000Nm of torque.

HeAvy-duTy The 25,000Max Earth Drill is generally meant for 15-22t excavators, so a custom heavyduty frame had to be designed and then fabricated in-house at Auger Torque’s Brisbane factory.

Working on a tight time frame and the remoteness of the work site presented challenges, but the unit was delivered to its new owner on time.

“We used the Auger Torque Earth Drill on our TL 12 highflow loader specifically to install cyclonic tie-down foundations for the solar frames that will power communication sites along a new railway line.

“The varying ground conditions, remote and difficult access, and extreme weather conditions are all incredibly harsh on the equipment.

“Our new Auger Torque Earth Drill 25,000Max performed faultlessly,” Steve Manning, Pilewest’s general manager, commented after the unit had been put through its paces for a few months.

Power Augers Auger Torque Australia has been selling a lot of high-end Earth

Drills over the past few months and had the opportunity to quote a couple of these units for Australian construction contractor Shannon Civil to suit its 14t and 21t Hyundai machines.

The recommendations included an Earth Drill 30,000 for the 21t machine and one of its new Earth Drill 20,000s for Shannon Civil’s 14t machine.

To go with the Earth Drills, Auger Torque supplied a range of augers and clean-out discs, ranging from 750mm all the way to 1,500mm in diameter, along with a range of extensions to get down to the maximum 7m depth required.

The equipment will be instrumental in the construction of the foundations for a PowerLink electricity transmission substation, and Shannon Civil will be in charge of the construction of a total of three stations near Miles in Queensland.

“The scope of works are to bore and pour a large number of 750mm-, 1,200mm- and 1,500mm-diameter holes ranging in depth from 4m to 7m,” says Shannon Civil’s Nevano Cowan.

When the product was delivered to the work site at Miles, the installations were performed by Auger Torque without glitches, and Nevano Cowan’s team was able to start drilling straight after.

Auger talk Auger Torque manufactures earthmoving attachments at its factories in the UK, US, Australia and China. The products are distributed through its global dealer networks.

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Top: the Auger Torque Earth Drill 30,000Max and 1.5m-diameter PA Rock Auger Above: an industry-first tracked loader with 25,000Nm of torque.

Far left: Auger Torque Earth Drill at work Near left: Auger Torque produces Earth Drills for excavators up to 45t

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Auger drilling

diving right in Bauer Technologies recently completed piling works for the Network Rail Acton Diveunder project in West London A CFA-adapted Bauer BG28 piling rig working on the Acton Diveunder project

“This marks the first Network Rail project Bauer Technologies has undertaken”

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he Acton Diveunder, a new rail underpass just outside Acton Main Line station, is part of the Crossrail project being delivered by Network Rail, the authority responsible for the UK’s railway network.

When Crossrail services begin in 2018, there will be a marked increase in trains running along the Great Western Main Line.

Presently, trains need to cross main-line passenger tracks when entering and leaving the Acton freight yard. Once the diveunder is completed, it will provide paths for freight trains going to and from the Acton yard, without disrupting passenger rail services.

The £4 million (US$6.8 million) project was awarded by principal contractor BAM Nuttall and required Bauer Technologies to install 950 linear metres of secant and contiguous pile walls, consisting of 1,400 continuous flight auger (CFA) piles in diameters of 600mm, 750mm and 900mm.

The piles, which were up to 16m deep, were installed using a CFA-adapted Bauer BG28 piling rig. The works were executed within the live rail environment, in a shunting yard adjacent to the Acton Main Line.

Both the restricted working area and the linear nature of the site proved real challenges to Bauer.

Each working day was meticulously planned around train movements, access restrictions and pile installation cycles to minimise potential detrimental impact on the piling works, live

main rail lines and other third parties involved in the project.

Working closely with a specialist team of engineers from BAM Nuttall, Bauer Technologies developed a robust process for ensuring advanced Adjacent Line Open (ALO) drawings were approved

by BAM Nuttall, to allow the works to continue without causing delays.

The ALO initiative is an integrated process embedded within the rail sector to demonstrate control over plant movement in close proximity to running train lines. All large plant operating on site was fitted with Network Railapproved slew restrictors, to ensure that the highest possible level of control was maintained throughout the project.

Crossrail fact Crossrail, the cross-London railway project, is the biggest construction project in Europe and is one of the largest single infrastructure investments undertaken in the UK.

Stringent lifting controls were also implemented for the project, to ensure safe execution of the works, with particular focus on mitigating the potential for ‘overswing’ across adjacent live running lines or any clash with Network Rail infrastructure.

FurTHer cHAllenges The second phase of the Acton Diveunder project raised a further site-specific challenge for Bauer Technologies.

It soon became apparent to the team on site that there was a requirement to be extremely creative with mobilisation of the plant and equipment, due to the location of a low bridge and the need to cross a live railway line in order to access the rigging-up area.

Rising to this challenge, Bauer Technologies used its in-house expertise to dismantle critical parts of its rig, in an organised sequence, to enable it to be re-assembled once in position.

Commenting on this complex phase of the project, Kevin Hague, operations manager, says: “Bauer Technologies specialist engineering staff

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Auger drilling

carried out thorough dimensional checks and performed

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trials required to satisfy the client team, demonstrating that mobilisation and erection of the plant could be achieved without failure or incident.

“Working under an approved staged sequence of works, the rig erection was successfully completed, without any problems.

“This demonstrates the unique in-house capability that Bauer Technologies has to tackle and solve significant logistical challenges involving plant.”

Speaking about the overall project, Bauer’s managing director, Martin Blower, says: “This was an exciting project for Bauer Technologies, as it further strengthened the existing relationship we have with BAM Nuttall, and it marked the first Network Rail project the company has undertaken.

“The close proximity of live rails is always a major consideration on any Network Rail project

and posed a significant challenge on the Acton project.”

37

Bauer’s range of rigs on show

Project timetable Phase one of Bauer’s scope of works at Acton started in April 2013 and was completed in August 2013. Phase two of the project, in turn, began in March 2014 and was completed in May.

25/07/2014 10:39

38

special report

rotary drills: the next generation Ken Stapylton, vice-president of surface drilling, introduces Sandvik Mining’s new DR461i rotary blasthole drill rig – to be launched later this year The DR461i is the first in Sandvik Mining’s series of nextgeneration rotary drills

S

andvik Mining is continuously evaluating and evolving its products to meet customers’ changing needs. That means not just developing new technology, but implementing the right technology for the right application.

With that in mind, this year Sandvik Mining will launch the newest member of its surfacedrilling product line, the DR461i rotary blasthole drill rig – the first in its series of next-generation rotary drills.

Developed from the existing DR460 model and manufactured in Alachua, Florida, the Sandvik DR461i is equipped to drill in rotary or down-the-hole (DTH) configurations and is offered in single- or multi-pass form. The drill features a rugged design made to perform in extreme conditions, including the new

Sandvik S46HD heavy-duty blasthole undercarriage built specifically for mining.

Building on the Sandvik emphasis on safety, the DR461i includes additional walkways for enhanced serviceability and access, with open serrated grip-strut material.

The drill also offers an optional hydraulic main access stairway that is self-levelling. This means the steps stay parallel to the ground regardless of the machine’s position.

Access goes hand in hand with maintenance. So, with the DR461i design, Sandvik looked for ways to make maintenance simpler.

The drill features operator controls with a graphical user interface (GUI), which collects raw data from the drill and translates it into usable on-screen information for the operator.

The Sandvik DR461i features a

cab designed with the operator’s comfort in mind. The windows on the cab have been designed with an outward 5˚ tilt, reducing glare from sunlight when it hits the window, and a ‘safari roof’, which sits above the actual roof, with a 10cm (4in) air gap between them.

These features keep the temperature down, making the cabin more comfortable.

The DR461i is currently being tested in production at one of the world’s largest and lowest-cost gold mines located in Nevada. It will be launched globally this year.

The DR461i is currently being tested at one of the world’s largest, lowestcost gold mines.

Inset: The existing DR460 model, from which the DR461i was developed

Read more about the Sandvik DR461i rig in GeoDrilling International’s surface drilling feature in the October 2014 edition.

July / August 2014 Sandvik_GDI1407.indd 38

25/07/2014 10:17

special report

green scheme for Mancunian cathedral Eco Friendly Installations delivered an accelerated geothermal drilling programme in Manchester, northwest England

39

Eco Friendly Installations installing a new green heating scheme for Manchester Cathedral

W

ales-based Eco Friendly Installations, a specialist in radial drilling and ground-source heatpump installations, deployed its bespoke Marini rig from Skelair International, a supplier of ground-engineering and rockdrilling equipment, on the highprofile Manchester Cathedral development project.

The rig carried out the radial drilling and pipe installations to support a new ground-source heat-pump system. The cathedral’s old underfloor heating system dated from the post-war rebuilding era of the 1950s.

efficient drilling The installation of a new green heating system, including underfloor heating and a 100kW heat pump, required major floor excavation works within the cathedral.

While construction projects commonly work to tight timescales, as a significant development project for Manchester and Salford, the heating part of the scheme could only be on-site from April until the end of November 2013 – so that the cathedral could reopen in time for Christmas services.

As such, the programme of works allowed just 12 weeks for drilling, the specification of which demanded 32 boreholes at a total length of 1,600m.

Assessing the site constraints, timescales and drilling requirements, it became apparent that two drill rigs would have to run simultaneously.

With two specialist geothermal drilling rigs in its fleet, Eco Friendly Installations was well

placed to undertake the project and worked with the cathedral architect and contractor to identify where the drilling chambers could be based according to land boundaries, ground conditions and proximity to the cathedral.

tight angles Four drilling chambers were required in total, with the Marini rig allocated to the two chambers that did not require the mast to swing – demonstrating its flexibility and ability to drill tight angles even where there is

limited room to manoeuvre.

“The depths that had to be achieved, the time constraints and city-centre location made this a challenging project to deliver.

“However, as specialists in this area we had the right experience and – more importantly – the right machines to be able to meet the client’s requirements,” says Hans ten Wolde, managing director of Eco Friendly Installations.

Unlike the hard coastal conditions where the Marini was first deployed by Eco Friendly

“Assessing the site constraints, timescales and requirements, it became apparent that two rigs would have to run simultaneously”

July / August 2014 Marini_GDI1407.indd 39

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special report

40

into its own on these developments,” comments Chris Neighbour, director of sales at Skelair International.

site restrictions

The Marini rig working under challenging coastal conditions

Installations, in Manchester city centre the ground was composed of mudstone and contained a high level of water.

The challenge here therefore was to drill and case without the holes collapsing. Eco Friendly Installations controlled this by using a reamer and drag bit and

closely monitoring the density and responsiveness of the ground.

“From coast to city centre, you couldn’t really get two projects that are more diverse, yet fulfilled with ease by the same machine.

“The Marini has really come

There were a number of challenges created by operating in the heart of Manchester city centre, mainly in terms of access and bringing the rigs to site, but also regarding restrictions on working times.

For example, material deliveries could only arrive on-site before 11am due to the area being pedestrianised.

“Timescales were already extremely pushed on this project, but as there was no option to extend our working hours, we had to be extremely efficient and effective during the times we were on-site,” Ten Wolde explains.

The nature of the site as a burial ground caused further disruption to the drilling activity because should any graves or remains be uncovered during the process, work had to be suspended and the relevant archaeological protocol initiated.

Further details on the Manchester Cathedral development project can be found at the following website: www.manchestercathedral.org/heating-repairs; for more information on Marini rigs, contact: chris@skelair.com or mariobozzola@mariniqg.it.

Editorial

Annual subscription – UK and Europe: £95.00 (€160.00 eurozone) Rest of World: US$170.00. Additional current copies are available to subscribers at £12 (US$21) each

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Advertisement offices Head office Contact: Richard Dolan Aspermont Media, 120 Old Broad Street, London EC2N 1AR, UK T +44 (0)20 7216 6060 F +44 (0)20 7216 6050 E richard.dolan@aspermontmedia.com UK & Australia Contact: Linda Winfield T +44 (0)1268 769666 E linda.winfield@geodrillinginternational.com Germany & Austria Contact: Gunter Schneider GSM International, Postfach 20 21 06, D-41552 Kaast, Germany.

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T +44 (0)20 8955 7050 E subscriptions@gdi.com Aspermont Media Ltd, Chancery Exchange, 10 Furnival Street, London EC4A 1YH, United Kingdom Publisher Robin Booth Chairman Andrew Kent

GeoDrilling USPS 001–430 is published monthly, except February and July, which are combined issues (Jan/Feb and Jul/Aug), by Aspermont Media, 120 Old Broad Street, London EC2N 1AR UK The 2014 US annual subscription price is US$170. Airfreight and mailing in the USA by Agent named Air Business, c/o Worldnet Shipping USA Inc., 155-11 146th Avenue, Jamaica, New York, NY 11434. Periodicals postage paid at Jamaica NY 11431 US Postmaster: send address changes to GeoDrilling International, Air Business Ltd, c/o Worldnet Shipping USA Inc., 155-11 146th Avenue, Jamaica, New York NY 11434 Subscription records are maintained at Aspermont Media Ltd, Chancery Exchange, 10 Furnival Street, London EC4A 1YH, United Kingdom Aspermont Media, publisher and owner of GeoDrilling International (‘the publisher’) and each of its directors, officers, employees, advisers and agents and related entities do not make any warranty whatsoever as to the accuracy or reliability of any information, estimates, opinions, conclusions or recommendations contained in this publication and, to the maximum extent permitted by law, the publisher disclaims all liability and responsibility for any direct or indirect loss or damage which may be suffered by any person or entity through relying on anything contained in, or omitted from, this publication whether as a result of negligence on the part of the publisher or not. Reliance should not be placed on the contents of this magazine in making a commercial or other decision and all persons are advised to seek independent professional advice in this regard.

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SUPPLIES & SERVICES

AUGER BORING EQUIPMENT

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26/1/1

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Euro Repair Services Ltd., Clipstone Holding Centre, Mansfield, Nottinghamshire, NG21 9AP

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SUPPLIES & SERVICES

44

DRILL RIGS (ROTARY)

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SUPPLIES & SERVICES dci drillquip classified 2012:proof

21/

DCM DRILLQUIP LTD

EXPLORATION DRILLING

Manufacturers of Drilling Equipment

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■ Rotary / Blast Hole Drill Rods ■ Casing – Full range manufactured ■ Cement Grout Shoes ■ Agents for Kwikzip Centralizers ■ Drill Collars ■ Adaptors ■ Hole Openers

45

FOUNDATION DRILLING EQUIPMENT

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CR-12

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CR-16

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CR-26

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GROUTING EQUIPMENT ATLAS COPCO CONSTRUCTION & MINING (see under Bits) BASKI PACKERS USA. www.baski.com info@baski.com Ph.+1 (303) 789-1200 Fax: +1 (303) 789-0900 CHENALORD DRILLING SUPPLIES (see under Equipment) COLCRETE EURODRILL (see under Drill Pipes, Rods & Tubulars)

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S Y S T E M S

Manufacturers and suppliers of diamond drilling, auger and environmental equipment

T h e I n n ova t o r s JKS Boyles Limited UNIT 9, SALCOMBE ROAD, MEADOW LANE IND. EST., ALFRETON, DERBYSHIRE DE55 7RG, UK Tel: +44(0)1773 835323 Fax: +44(0)1773 835075 Email: sales@jks-boyles-ltd.co.uk www.jksboyles.co.uk

Your best medium for Drilling Sector Recruitment.

Use GeoDrilling International to advertise your vacancies – have you also considered advertising on our popular website – www.geodrillinginternational.com at no extra cost!!!

Call Linda Winfield on Tel: +44(0)1268 769666 Fax: +44(0)1268 769665 e-mail: linda.winfield@geodrillinginternational.com

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SUPPLIES & SERVICES

46

Tel: +44 (0)1246 544700 Fax: +44 (0)1246 544701 Email: info@bulroc.com Web: www.bulroc.com

 Construction

Special Supplements

 Oil & Gas  Water Well

HD

SE R

IE

S

FOR YOUR NEXT DRILLING PROJECT THINK BULROC....

 Geothermal  Seismic  Quarrying  Mining

C

M

Y

CM

MY

CY

CMY

K

BREAKTHROUGH PERFORMANCE

Halco Advert.pdf 1 27/04/2012 16:54:43

EXPERIENCE TO DRILL DEEPER...

Today, Halco precision engineered DTH hammers and drill bits are used to handle the toughest jobs around the globe.

With more than 60 years experience, Halco continues to offer the most reliable and durable DTH products in the industry.

Unique solutions for the global Drilling industry Tailor-made publications created by the world’s top mining media team.

Whatever your next drilling application, Halco can reduce costs and give Breakthrough Performance.

• Mining

• Waterwell

• Quarrying

• Geothermal

• Exploration

• Oil and Gas

• Construction

• Grade Control

Customers include governments, resource companies, agencies and institutions.

For corporate supplements, contact Alex Charnaud on: Tel: +44 (0) 1422 399900 salesuk@halcorocktools.com halcorocktools.com

+44 (0)20 7216 6086 alex.charnaud@mining-journal.com

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SUPPLIES & SERVICES

47

BOODE CLASSIFIED 12CM 2012:proof

25/1/1

waterwell systems • PVC Screens & Casing • CSS™ - Continuous Slot PVC Screen • BGP™ Gravel Coated Screens • WellPoints • Boodepac™ Dual Wall Screens • Carbon Free/Standard HDPE Screens & Casing • Full Range of Accessories • Johnson Screens® Stainless Steel Screen & Casing Systems • Baroid Industrial Drilling Products® - Muds, Fluids & Additives • Boresaver – Well Rehabilitation Treatments

HIRE (DOWN-THE-HOLE HAMMERS) ATLAS COPCO CONSTRUCTION & MINING (see under Bits)

ATLAS COPCO CONSTRUCTION & MINING (see under Bits) BULROC (UK) LTD (see under Hammers Down-The-Hole)

16952DrillingAd-HP:Layout 1

HYDRAULICS

19/1/09

12:16

Page LOGGING 1

BOODE b.v P.O. Box 27 NL 2760 AA Zevenhuizen Holland tel: +31 180 63 27 44 fax: +31 180 63 30 90 E-mail: info@boode.com Internet: www.boode.com

EUROPEAN GEOPHYSICAL SERVICES, The Stables,Sansaw Business Park, Hadnall,Shrewsbury SY4 4AS, UK Tel: 01939-210710. Fax: 01939-210532 E-mail: eurogeophys@europeangeophysical.com www.eurpopeangeophysical.com ROBERTSON GEOLOGGING LTD. Deganwy, Conwy LL31 9PX, UK. Tel: +44 1492-582323 Fax:+44 1492 582322.

E-mail: sales@geologging.com Website: http://www.geologging.com

HydraulicPumps (UK) Limited

MUDS

Hydraulic Pumps (UK) Ltd is the United Kingdoms leading hydraulic engineering company specialising in the repair and replacement of hydraulic pumps and motors to the Drilling Industry.

BOODE UK LTD (See under Drilling Fluids) CLEAR SOLUTIONS INT. LTD (see under Drilling Fluids) JKS BOYLES UK LTD (see under Equipment)

FREE collect, strip, assess & quote from the UK Mainland & Ireland

Read specialised reports on every aspect of drilling in soils and rocks – wherever you are

OIL & GAS

www.hydraulicpumps.co.uk Freephone:- 0800 360370 Tel:- 01709 360370 Fax:- 01709 372913

CHENALORD DRILLING SUPPLIES (see under equipment) HALCO ROCK T0OLS (see under Hammers down the whole)

Email:sales@hydraulicpumps.co.uk Hydraulic Pumps (UK) Limited

Heavyparts Hydraulics Ltd Fully Authorised Service and Repair Centre for Kawasaki Hydraulic Products All leading pump Brands catered for, full recon service, test, spare parts supply

BOODE U.K. Ltd - U.K. Brindley Road, Dodwells Bridge, Hinckley, Leics., LE10 3BY tel: +44 (0)1455 61 13 17 fax: +44 (0)1455 61 09 71 Email: info@boodeuk.com

LARGE-DIAMETER HAMMERS

Also Specialists in hydraulic pump & motor repairs for hydrostatic transmissions

OVERBURDEN DRILLING SYSTEMS DOWNLOAD TODAY

ATLAS COPCO CONSTRUCTION & MINING (see under Bits) BULROC (UK) LTD (see under Hammers Down-The-Hole)

PIPE CASING & SCREENS CLEAR SOLUTIONS INT. LTD (see under Drilling Fluids) DCM DRILLQUIP LTD (see under Equipment)

How to get the app Visit www.appstore.com/ GeoDrillingInternational

SAUER DANFOSS

K3V; K5V PUMP

BOSCH REXROTH

LARGEST STOCKISTS OF KAWASAKI PUMP & MOTOR SPARES IN THE UK

CALL US ON 01706 356676 Sales@heavyparts.co.uk www.heavyparts.co.uk

Visit our website www.geodrillinginternational.com iPad Edition

Media

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48

SUPPLIES & SERVICES

All you need from one source

STAINLESS SCREENS

FOR SALE

BOODE UK LTD (see under Pipe Casing and Screens) CLEAR SOLUTIONS INT. LTD (see under Drilling Fluids) DCM DRILLQUIP LTD (see under Equipment)

SPECIALIST VEHICLE SERVICES DRILLING RIGS AND EQUIPMENT REPAIRS

WATER WELL EQUIPMENT

RIG HIRE

ATLAS COPCO CONSTRUCTION & MINING (see under Bits) CHENALORD DRILLING SUPPLIES (see under Equipment) COLCRETE EURODRILL (see under Drill Pipes, Rods & Tubulars) DCM DRILLQUIP LTD (see under Equipment) DANDO DRILLING INT. LTD., Old Customs House, Wharf Road, Littlehampton, W. Sussex BN17 5DN, UK Tel: +44 (0)1903-731312, Fax: +44 (0) 1903-730305, Email: info@dando.co.uk, www.dando.co.uk PROQUIP DIRECT LTD, (See under Borehole Pumps)

• PVC casings and screens • Steel casings and screens • PEHD and Aqua 23 casings and screens • Well heads • Pumps • Drilling fluids • Grouting material • Geothermal probes

STÜWA Konrad Stükerjürgen GmbH F: +49 5244 407-0 www.stuewa.de Hemmersweg 80 D-33397 Rietberg info@stuewa.de Our Partner in UK: Casagrande UK F: +44 1494 794990 info@casagrandeuk.com

PUMPS DRILL SUPPLY LTD, 41 Green Lane, Lower Kingswood, Surrey KT20 6TJ, U.K. Tel: 01737 83 2820. Fax: 01737-833025.

Email: drillsupply@btconnect.co JKS BOYLES UK LTD (see under Equipment) PROQUIP DIRECT LTD (see under Borehole Pumps)

REVERSE-CIRCULATION SAMPLING ATLAS COPCO CONSTRUCTION & MINING (see under Bits) BULROC (UK) LTD (see under Hammers Down-The-Hole) CHENALORD DRILLING SUPPLIES (see under Equipment) HALCO ROCK TOOLS (see under Hammers Down-The-Hole)

ATLAS COPCO CONSTRUCTION & MINING (see under Bits) BULROC (UK) LTD, (See under Hammers Down-The-Hole) DCM DRILLQUIP LTD (see under Equipment) HALCO ROCK TOOLS (See under Hammers Down-The-Hole) PROQUIP DIRECT LTD, (See under Borehole Pumps) CHENALORD DRILLING SUPPLIES (see under equipment)

• • • • •

FULL DESIGN DRILLING UNDER FLOOR HEATING HEAT PUMPS COMMISSIONING

RECRUITMENT

ESG’s Geotechnical Division has embarked on a programme of improvement that will deliver significant growth. We are currently looking for Cable Percussion Lead Drillers and Assistant Drillers to work in the following areas: South of UK, London, Midlands Area Qualifications required: NVQ Level 2 in Land Drilling, Must have full UK Driving Licence, London based drilling experience an advantage Supported by significant investment and a committed management team, opportunities are now available to join ESG in this important period of growth and change.

For more details, and to apply online go to www.esg.co.uk/ vacancies or simply email your CV & Cover letter to careers@esg.co.uk

WANTED

Earthtest Energy Tel: +44 (0) 1484-681314 Email: info@earthtestenergy.com www.earthtestenergy.com

Wanted

WELL PACKERS ATLAS COPCO CONSTRUCTION & MINING (see under Bits BASKI PACKERS USA, www.baski.com info@baski.com Ph: +1 (303) 789-1200 Fax: +1 (303) 789-0900 INFLATABLE PACKERS INTERNATIONAL PTY LTD, Designer and Manufacturer, Perth, WA, Australia, Tel: +61 8 9204 2448, www.inflatable-packers.com PROQUIP DIRECT LTD, (See under Borehole Pumps)

WELL REHABILITATION

used drilling equipment Drill rigs any year/make compressors, mud pumps, drill pipe etc Email: cullinaneplant@gmail.com Tel: Sean (+44) (0)7587268871 (+353) (0)868115128 eNewsletter

SHOCK ABSORBERS

GeoDrilling International’s monthly eNewsletter is delivered directly to approximately 5,000 subscribers.

Our recipients include board members, middle management, contractors, engineers as well as government and utilities companies.

BULROC (UK) LTD (see under Hammers Down-The-Hole) CHENALORD DRILLING SUPPLIES (see under Equipment)

SIMULTANEOUS CASING SYSTEMS ATLAS COPCO CONSTRUCTION & MINING (see under Bits) BULROC (UK) LTD (see under Hammers Down-The-Hole)

If you would like to receive this newsletter, go to www.geodrillinginternational.com and enter your email address in the red box at the bottom of the screen.

SITE INVESTIGATION ROBERTSON GEOLOGGING LTD. Deganwy, Conwy LL31 9PX, UK. Tel: +44 1492-582323, Fax: +44 1492 582322.

E-mail: sales@geologging.com Website: http://www.geologging.com STRUCTURAL SOILS LTD, The Old School, Stillhouse Lane, Bedminster, Bristol BS3 4EB, UK. Tel: +44 (0) 117 947 1000 E-mail: admin@soils.co.uk

Tel 01924 898 555 Mobile 07710 02 58 58

WATER WELL / GEOTHERMAL DRILLING

TOTAL GROUND SOURCE HEATING SOLUTIONS

PVC Pipes approved for use in public water supplies

Rotary & Shell and Auger Restricted Access S.A. Rigs Grout mixer - Pump Units

WIRELINE ATLAS COPCO CONSTRUCTION & MINING (see under Bits JKS BOYLES UK LTD (see under Equipment)

If you would like to place an advertisement, please contact Linda Winfield on+44 (0)1268 769666 linda.winfield@geodrillinginternational.com July / August 2014

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KR 806-5G Engine power: 180 kW Tier 4f / Stage 4 Weight: 21 t New kinematic Power sharing

UNSTOPPABLE! KLEMM drilling equipment stands for the latest, most sophisticated drilling technologies made in Germany. Because every detail is thought through and designed in a particularly robust way our systems stand for a unique, unstoppable DYNAMIC POWER! Benefit from excellent reliability and performance with the lowest total cost of ownership (TCO). We‘ll tell you how we can make you unstoppable – give us a call: +49 2761 705-0

www.KLEMM-BOHRTECHNIK.de

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Geoprobe 7822DT ®

A new four-speed augerhead makes rock coring possible with the Geoprobe® 7822DT. This compact drill head provides the versatility for torquing-in hollow stem augers to high-speed rock coring applications. From direct push to hollow stem augering, from air and mud rotary to concrete and rock coring, the 7822DT is built to expand with your business. A new 7822DT brochure is available by calling 1-800-436-7762 or from www.geoprobe.com.

Geoprobe® Model 7822DT collects geotechnical information for a new mining site.

Geoprobe Machines and Tools for Sampling

SOIL•WATER•ROCK

®

Geoprobe Environmental Technologies, s.a./n.v.

Direct Push. Rotary. Sonic.

00.32. 67.44.25.41

Geoprobe Systems® USA 800-436-7762 785-825-1842

www.geoprobe.com

115 ft. of rock core samples collected using the 7822DT.

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