Page 1

Inside 2

Exploring the Caspian


The advantages of sector modelling


Technical focus


Consultant’s corner


New contracts


In the community




Latest news

Sept 2013 Issue 16

The latest news, vacancies, features and events involving OPC operations throughout the world

Exploring the Caspian Feature on OPC Kazakhstan

The OPC business in Kazakhstan is going from strength to strength following the extension of a key contract to provide expertise to the Caspian Explorer, the submersible drilling barge rig, operated by Teniz Burgylau, Kazakhstan’s first national offshore drilling contractor.

Country profile Size Population Languages Currency Capital Oil reserves

2.7m sq kilometres* 17 million people Kazakh & Russian Tenge Astana 49b barrels**

* 9th largest in the world, ** 12th largest in the world

The Caspian Sea


OPC’s involvement in the project started at the end of 2011 when we were asked to tender for the supply of consultants to oversee the commissioning of the rig. Following a successful contract award, experienced consultants were sourced from the OPC network to start work in the spring of 2012 in a range of positions including rig management, electrical and mechanical engineering. The team were able to identify and resolve issues during final fit and commissioning so that the rig could commence drilling in May 2013. Almas Nurbayev, General Manager for OPC Asia commented “We are delighted that the Caspian Explorer has started drilling and that our contract has been extended for another year. Our team has been The Caspian Explorer instrumental in getting the rig to operational state and the customer has been very happy with the knowledge and expertise delivered by our consultants.” The Caspian Explorer is the first offshore rig operated by a Kazakh contractor and the OPC consultants have been able to mentor and oversee local engineers, increasing local technical knowledge and capability. Initially established in 2010, OPC Kazakhstan has expanded to three offices to support both the Caspian Explorer contract and a number of other projects within the country. Almas explains “Kazakhstan is a huge country – the 9th largest in the world by territory and oil reserves – and we have operational offices to support our projects in the oil producing regions of Atyrau and Aktau, as well as our Head Office in the country’s capital Astana, where many of the oil company head offices are based.” OPC Kazakhstan supports

OPC Kazakhstan Established Offices Expertise Manager Phone Email

2010 3 (Astana, Atyrau and Aktau) Operations, Drilling, Engineering, Commissioning well testing, Reservoir modelling and audits, Training Almas Nurbayev +7 7172 501977

offshore and on-shore projects and provides skills such as production technologists, well test supervision and drilling skills. OPC also delivers training courses in Kazakhstan and provides specialist technical consultancy from the OPC USA and UK teams. The future looks very positive for Kazakhstan. It has oil reserves of 49 billion barrels, the 9th largest in the world, and with a current annual production only 13th in the world, there is a high potential for growth. OPC is expanding to provide technical services such as reservoir modelling and reservoir audits. Almas continues “A number of Kazakhstan based companies and joint ventures are looking to raise money on international stock markets and a well-respected organisation such as OPC could help with an independent valuation of these assets” So everything is bright in Kazakhstan? “In the summer certainly!” says Almas “temperatures average nearly 40 degrees centigrade and it can get very hot. But the winters are very cold – with an average of minus twenty degrees centigrade – so much so that offshore drilling is strictly a summer occupation and the Caspian Explorer will return to port in the winter.” Contact Almas at in Astana if you’re interested in the work undertaken by OPC in Kazakhstan.

Technical white paper

By Jim Ayton, Technical Director of OPC

The advantages of sector modelling OPC Newsletter Technical Studies Input

Within the Technical Services team at OPC we carry out a lot of sector modelling and conceptual modelling. Not only does this approach greatly reduce the computation time and save time on the project for the client, but it also allows us to address some key questions before we build the full field model. I feel this approach will give the client a much better understanding of the reservoir behaviour. Some examples of this approach are laid out below.

Naturally Fractured Carbonate Gas Field

We had two gas accumulations next to each other which were connected by an aquifer. One accumulation had been drained while the other had been left alone other than a welltest which showed depleted pressures in line with the drained accumulation. We wanted to address the cause of water movement and early breakthrough in the depleted accumulation through the fracture network. A dual porosity model was built and matched to the overall volumes and pressures for the reservoirs.

Not only did this give us an understanding of how the reservoir might be behaving on production, but it also gave an insight that there was not a large aquifer, simply a hydraulic connection with another accumulation.

Tight Gas/Condensate Reservoir

One of the issues that always crops up with a gas condensate reservoir is the concept of condensate banking. Whilst a large number of reservoirs show this effect to be minimal on production, the question is always asked. To tackle this we built sector models of the reservoir. One was a fine grid radial model of a producer and four quarter gas injectors in the outside radial grid cell at 90 degrees to each other, and the other was a square coarse grid sector model with the same size cells and vertical resolution as the full field model with again, four quarter injectors at the corners and the same gas initially in place. The reservoir properties of both models were those of one of the wells. We ran the models at the same rates for 25 years of production with all produced gas reinjected after condensate removal. The approach then taken was to introduce a skin in the coarse grid model that would match the flowing bottomhole pressure of the fine grid model through the life of the well.

Cross section through model showing water saturation before gas production

Coarse Grid Sector Model

Cross section through model after gas production from one accumulation


Fine Grid Radial Model

Conceptual Model Cross Section – Water Saturation

Well Flowing BHP’s matched using a skin factor adjustment

Conceptual Model Cross Section – Gas Saturation

As can be seen, there was an adjustment required to match the models early on once dew point was reached in the wellbore vicinity, but condensate stripping by the lean injection gas reduces this over time. For the full field model, skin factors would then be used to replicate the same effect.

Oil Rim Development of Field with Gas Cap

In order to develop a technique for predicting production forecasts for an oil rim development, it was necessary to build a conceptual model of the field and match the overall field rates of oil gas and water as well as reservoir pressure. Not only did such a model enable the prediction of the future production trends but also gave an insight into the coning of both water from below and gas from above to the horizontal oil production wells.

Predicted Future Trends

Jim Ayton Technical Services Director +44 (0)20 7428 1111


Technical Focus Facilities Process Engineering Facilities Process Engineering consultancy is a growing area for OPC’s Technical Services division. This has seen a business development change for OPC over the last 2 years as traditionally our core business has focussed on subsurface engineering and geosciences consultancy. This development enables us to satisfy the growing demand from our clients to provide integrated engineering concepts within our field development planning for the best technical and commercially viable subsurface & surface development solution for each asset. Our study work spans conventional and unconventional onshore and offshore oil and gas brownfield and greenfield developments and includes evaluating existing facilities for debottlenecking and optimisation.

On a recent FDP we were able to reduce the CAPEX of the project for subsurface and process facilities in the initial phase by a factor of three, whist improving the IRR from under 20% to more than 45%. The study was for the development of an onshore gas field including the evaluation of the original standard facilities and improving the basic concept to simplify the design of the gas treatment facilities. Work continues to include water production/ handling facilities and second phase development concepts. Additional support for other clients include gas from fracking opportunities in Scandinavia and a major review of a substantial field in the Komi Republic, Russia including heavy oils extraction and facilities.  OPC’s Facilities Process Engineering function is led by Howard Simons, a Graduate of Chemical Engineering and Fuel Technology with over 30 years’ experience in conceptual and detailed facilities process engineering of upstream, midstream and refining oil and gas on and offshore projects and operations covering; grass roots, revamps, debottlenecking and optimization.

Challenge yourself, are you a well test expert? At the SPE London Oil and Gas event in June 2013, OPC ran a competition to see who knew most about well test interpretation. The winner scored four out of five – see how you do. The answers are published on page 12.

1 2 3 4 5

How is radial flow defined on the derivative plot and what pressure change does it describe? How is any remaining pressure change categorized after radial flow is defined? How do Mobility k/u and Storativity phi*ct effect the transient movement through the reservoir? Other than an upturn on the derivative and superposition plot, how can barriers be identified in the pressure data (hint: not using these two plots)? What is the characteristic response on a derivative plot for pressure behaviour dominated by compressible volume? Describe three well/reservoir configurations where it is present in the data.

For further information about OPC’s services please contact David Carney Group Business Development Manager +44 (0)20 7428 1111


Consultant’s Corner

In this regular feature, we find out about an OPC consultant with a quick-fire 5 minute interview. For this issue we have Dr John Holroyd, a Senior Consultant Geologist, who has recently been working on an OPC project at our London office.

John is a Senior Geologist with 30 years’ international experience focused on exploration, development and production geology, reservoir characterisation, sequence stratigraphy and facies analysis (clastic & carbonate), technical auditing/asset evaluation, on a foundation of rigbased field activity. After completing a first class honours degree at the University of Wales, Swansea, he then took his PhD in Geology at the same place, studying deep sea turbidite conglomerates and clastics from the Ordovician and Silurian on the Scottish Southern Uplands and Welsh Basin areas. John began his career in the oil industry in Libya initially with the Libyan Government and then with Occidental Oil. Following career moves with Britoil and Enterprise Oil, John has worked as a consultant in 1988 and since 1992 and has established a reputation as an expert consultant geologist. His international exposure, working in country or related to, includes most of West Africa from Liberia to South Africa, India, Pakistan, Azerbaijan, Kazakhstan, Eastern Europe, Dubai, and of course includes significant experience in all North Sea basins



Dr John Holroyd

What is your current role? Since May 2013 I’ve been working on a project with OPC to provide an evaluation of assets in the North Sea on behalf of a potential purchaser.

What has this project delivered for the client? As often occurs in projects of this type, an independent evaluation of the data by a senior geologist using different methods of analysis has uncovered new factors and issues. Fortunately in this case, it appears that the overall size and value of the assets may have been underestimated, thus benefiting the client purchaser.

Had you heard of OPC before this contract? I have been in contact with OPC for more than 10 years and the London technical services team is a pleasure to work with.



Why did you pick Geology and what do you think of its role in the industry? As a student I really enjoyed both at arts and science. At A ‘level I needed an extra science to get in to do Geography and Geology was the only one of two options available that suited me, as it also came under the same Department. Geology is a subject which is not bound by the rule book. It enables one to use the imagination in a way not afforded by the ‘pure’ sciences and can benefit those with a mixed artistic and scientific ability and interest. As the ‘Mother’ of all sciences, it encourages you to think laterally, conceptually, three dimensionally and to look for different ways of investigating and interpreting data. It can provide an incredibly important role to the industry. Twice in my career I have reanalysed data and identified deposits that had been overlooked – resulting in fields that were to be abandoned being re-drilled or even wells re-logged and delivering tens of millions of barrels of oil and in one case ensuring a rig remained on site for an additional four years – delivering employment to a large number of workers and offsetting the final removal costs, not to mention the input to the Exchequer and the UK economy. That’s part of the attraction for me – the challenge of analysing data and finding answers that can really contribute to the economy. 07

New contracts

We are pleased to announce the following selection of new contracts awarded in the last quarter. This list is not comprehensive but representative. Well Test Interpretation Support for leading international natural resources company headquartered in the USA with on and offshore oil and gas production facilities with growth potential including emerging ultra-deep gas trend.

Well test Analysis, Reservoir Engineering Support and Data Room Evaluation Study for the UK E&P business of one of the world’s largest energy companies.

Shale Gas Field Development Plan Study for UK Independent upstream development and production company with assets in the Southern Gas Basin.

Pressure Transient Analysis Study of the full life cycle of UK offshore gas field water injection well to evaluate the changing skin factor for Chinese owned European subsidiary upstream oil and gas company with assets in the UK, Africa and North America.

Gulf of Mexico Wells PTA, PLT Analysis and Well Test Training for one of the world’s largest producers of major commodities including substantial oil and gas assets in the Gulf of Mexico, US onshore, Australia, UK, Middle East, Africa and Asia.

Call Off Contract for Reservoir Engineering and Surveillance Services for Major GCC upstream energy company, producing processing and transporting natural gas.

Reservoir Engineering, Production Forecasting and Well Test Witnessing for African Offshore Assets for one of the world’s largest global diversified natural resource companies with upstream interests focussed on oil production.


Call Off Contract for Surface and Subsurface Engineering Support for the UK operation of International oil and gas major with production assets in Europe, Middle East, Africa, Asia and the Americas.

Supply of Geosciences Consultants in UK and Norway for Major European oil and gas producer exploring and producing in Europe, North Africa, South America, Russia, the Caspian Sea region, and Middle East.

Call Off Contract for the Supply of Subsurface Engineering and Geosciences Consultants for one of the world’s largest investor-owned energy companies with assets across Europe, Russia, and North America and global developments. UK Onshore Gas Field Reservoir Engineering Study to review field water disposal and injection strategy for UK leading onshore hydrocarbon producer.

Exploration Well Testing Supervision for Asian joint operating company operating a cluster production sharing contract.

Petrel Modelling of CNS Reservoirs for Southeast Asia Major Energy Corporation with oil and gas exploration and production assets in the UK, Middle East & Africa, Southeast Asia, Oceania and North America.

Seismic Interpretation Study of Arabian Offshore Gas Field for oil and gas major with global activities in oil and natural gas exploration, field development and production.

Call off Contract for 1. Outsourced Engineering and Geosciences Support and, 2.Supply of Consultants for independent oil & gas exploration and production company with assets and exploration projects in the Middle East, North Africa, South and North America.

If you would like to know more about OPC services and how you can work with us either as a services provider or client with a need for support, please contact our Group Business Development Manager, David Carney. +44 (0)20 7428 1111 +44 (0)7824 877 685 opc-dc


OPC in the community OPC supports SPE Imperial College field trip to Trinidad Every year, the SPE student chapter at Imperial College participates in an international field trip. The field trip gives the students (MSc Petroleum Engineering) the opportunity to observe the roles and responsibilities of petroleum engineers and to see first-hand how the industry works. In May 2013 the SPE student chapter visited Trinidad and Tobago where they visited Petrotrin’s refinery and offshore facilities, Schlumberger and Tucker Energy Services facilities. The visits gave students the opportunity to see wireline and logging equipment, producing wells, production manifolds and other operational facilities. The field trip is supported by sponsorship from OPC and other oil and gas companies. Imperial College SPE Student Chapter thanking sponsor OPC on Petrotrin’s offshore production platform

OPC & the Princess Royal support Spinal Injuries Association quiz The ever popular annual Spinal Injuries Association (SIA) Oil & Gas Quiz was held concurrently in Aberdeen and London on Thursday 7th March 2013 with OPC one of the key sponsors of the event. HRH The Princess Royal attended the London event, along with a team from OPC who were fortunate to be introduced to Her Royal Highness. The event raised a total profit of £32,401.22 for the Spinal Injuries Association, and this includes the table sales, raffle, heads and tails game and both the live and silent auctions. Piers Johnson sat at the top table with the Princess Royal and was sorely missed by the OPC quiz team who finished in a satisfactory but not earth shattering 19th place out of 59. When introduced, Ada Branfield complimented the Princess Royal’s brooch as we can see in the photo here:

From left: Ada Branfield, David Carney, Byron Johnson, the Princess Royal, Kat Cook

OPC consultant to climb Cho Oyu Good luck to James Grieve, Chief Electrician on rotation on the Caspian Explorer in Kazakhstan, who will be climbing Cho Oyu in September.


Are you a well test wizard?

The answers...

1 2 3 4 5

How is radial flow defined on the derivative plot and what pressure change does it describe? ‘Flat’ (unsloping) line (which has a value of 0.5 on a dimensionless log-log plot) describes pressure change in a homogenous, infinite acting isotropic reservoir before any heterogeneities, or reservoir boundaries, are sensed within the test duration. How is any remaining pressure change categorized after radial flow is defined? When you define radial flow on a derivative plot the rest of the dP is described as Skin. The type of Skin depends on where the stabilization is takene.g. in a partial penetration reservoir the first radial flow is over ‘hp’ and the second over ‘total h’ How do Mobility k/u and Storativity phi*ct effect the transient movement through the reservoir? Higher Mobility makes the transient move faster, while Higher Storativity makes the transient move slower. Other than an upturn on the derivative and superposition plot, how can barriers be identified in the pressure data (hint: not using these two plots)?

Piers Johnson

Learning & Training Piers Johnson, Managing Director of OPC, is recognised as one of the world-leading authorities on Well Testing and has been invited to give a lecture on “New Innovations in Pressure Transient Test Methods and Analysis” to the Society of Petroleum Engineers on 26th November 2013. Piers commented “I’m delighted to be invited to talk at the SPE evening in November and will be concentrating on the theory and application of Deconvolution. Few in the industry are fully aware of Deconvolution and why it is good for us – and I’m looking forward to a good interactive session.”

Book now Well test analysis (Basic theory & practise) London, Oct 22nd -24th 2013 Trainer: Piers Johnson Cost £1,500 per person

Change in pressure trend, or poor match of pressure data to type curve in the data plot of linear pressure vs. linear time.

Contact Kat Cook for more details: +44 20 7428 1111

What is the characteristic response on a derivative plot for pressure behaviour dominated by compressible volume? Describe three well/reservoir configurations where it is present in the data. Unit Slope Straight Line. Wellbore storage, large changes in Mobility and Storativity (composite models), extreme changes between layer properties or two layers with one depleting with the other infinite within the test duration.

How did you score? 0-1

Special needs – Book onto an OPC training course now!


Development opportunity – Refresher lunch and learn recommended


Top of the class! - Give us a ring about a job….


Tunisia & UK

Well site services   


We are looking for a supervisor with offshore/production platform back ground. Ideal candidates will be familiar with Coil Tubing, Well test, completions and fracturing.

Europe, various locations

Completions & well integrity An internationally experienced CWI is urgently required to assist our client. Using your expertise and sharing your hands-on experience, you will be tasked with managing and leading a team of Well Completion/Intervention Engineers and Supervisors in the planning and execution of the work programmes. Experience in drilling engineering will be an advantage with strong technical and HSSE skills, and be fully familiar with risk management tools and techniques as well as incident management.


Petrophysicist OPC is assisting an international operator based in Central London with their search for a Senior Petrophysicist who has experience of Field Development, well evaluation and NMR data with logs. This is an interesting project that may involve infrequent travel and involvement at a senior level in the company’s future plans for asset development. Software required: IP


Geologists, reservoir engineers, petroleum engineers and technologists Specialists are required to consult with an International Operator on a major field development project where the objective is to double production to million bopd. Hence the focus will be on asset production enhancement and field development.

Norway & UK

Geoscientists OPC are looking for consultant Geoscientists with around 10-15 years’ experience to work with our clients based in Norway & UK.

Qatar Kazakhstan

HSE advisors and senior HSE advisors OPC are looking for several HSE consultants who will be responsible for the development and implementation of the HSE programs. The roles encompass; supporting a safety critical organisation operationally and functionally in all aspects of HSE. The consultants will also be required to have experience of mentoring , personnel development, resource utilization, regulatory interface and program maintenance .

Engineer (technical planning) Our client Company requires the services of an experienced consultant engineer with a strong background in building production/development stage dynamic models for Carbonate reservoirs. The consultant will report to the Head of Technical Planning. The team the incumbent will be joining is engaged in field development planning, economic/ scenario analysis, upstream planning, scheduling, cost estimation budgeting, monitoring, interface management and performance analysis. Specific duties for the Technical Planning engineer will be to develop and prepare planning models for upstream capital projects and wellwork operations.


London & Aberdeen


RE Simulation To participate in reservoir studies using appropriate dynamic and static techniques whilst working with within a multidisciplinary team. The engineer will be required to provide input into reservoir management and surveillance to support operations in production planning and control activities. Essential: Emeraude, Prosper and Saphir experience.

Middle East, UK, Europe

Drilling engineers Incumbents will be responsible for the drilling engineering input to major projects, providing high quality Front End drilling design & planning activities including generation of well options, basis of design documentation, project well cost estimates and well delivery schedules.

Geophysicists We are seeking excellent Senior Geophysicists to work with a number of clients. We are interested in hearing from consultants with Exploration and Appraisal, Well Planning and Drilling, and Development/Production. All posts offer an exciting opportunity to work in highly experienced and skilled multi-disciplinary subsurface teams on world-class reservoirs.

Various International Locations

Well test supervisors / engineers    Consultants are required to observe and advise the operators regarding onsite execution of all offshore/onshore well testing operations.

Middle East, UK, Kazakhstan, Europe & Africa

Drilling supervisors (day and night) and superintendents FSU

Well engineers    OPC are seeking several Senior Well Engineers. The roles are operational and so this will also involve the execution of the drilling programs. You’ll need to have excellent people skills and a high level of personal integrity, as well as a reputation for innovation, effective communication, and the ability to capture and cascade best practices.

OPC have several worldwide requirements for these roles. An IWCF and international experience is essential. An aptitude for mentoring or up skilling is highly desirable. Strong leadership and interpersonal skills and experience of multi-cultural environments is mandatory.

UK, Europe, Africa

Reservoir engineer A highly experienced Reservoir Engineer is required by OPC to assist with the exploration and development of our client’s local and international operations. Poised to move into a critical stage of growth and development, they now wish to acquire a Reservoir Engineer to help execute their ambitious work programs.

Any of these vacancies suit you or somebody you know? Please email your current resume to: We are always looking for talented individuals with 10 years + experience in E&P so if nothing here matches what you’re looking for, still feel free to send us in your details or call us on +44(0)20 7428 1111. 13

Latest news

OPC successfully completes on largest ever contract In April this year, OPC completed on its largest ever contract – a seven year multimillion dollar consultancy services contract with a large Middle Eastern Exploration and Production Company. The agreement was won through a competitive open tender in 2006 as a call-off contract for the provision of consultancy services within petroleum engineering and geoscience. Originally viewed as a three year deal to provide around 10 consultants at any one time, the contract was extended several times, expanded to include drilling and operational skills, and increased in volume so that 42 consultants were assigned at the peak of the contract. Piers Johnson, OPC Managing Director commented, “This contract has been one of the key successes for OPC over the last five years. The client has given us feedback that, thanks to the professional knowledge and expertise of our consultants, they have been able to significantly increase both production and proven reserves within their fields – which has comfortably covered the cost of our services. I’d like to personally thank every one of the 93 consultants who have worked on this contract for OPC over the last seven years. I’m disappointed that we aren’t able to continue working with all of the consultants but I hope that we will do so again in the near future.”

The experience gained through the contract has allowed OPC to establish a real foothold in the Gulf. OPC has a full time office in Doha managed by Stuart Hart who has been successfully tendering for new projects in the region, and many of the consultants have now been re-assigned to new OPC projects. Piers commented “The successful completion of this contract has established OPC’s credentials as a serious top quality technical service provider - which was never in doubt, but needed proof! We now have the ability to go out and bid for new sizeable projects and already have two new contracts signed up in Qatar and I am confident that the Doha office will go from strength to strength over the next three years. “

OPC in Doha A few of the team at OPC’s Christmas Party at Ipanema’s in Doha. From left Sam Azer, Senior Production Geologist, Rowan Stanley, Geomodeller, Janet Buencamino, OPC Administration Assistant – Middle East and Nordine Batache, Petrophysicist.


The winner of the caption competition in Issue 15 The winner of the caption competition in Issue 15 was David Jessop whose suggestion was: “Chaos for commuters in Doha, as confusion between “heavy oil transport” and “heavy traffic” leads to unsuccessful steamflooding effort”

Laura Kamrath joins OPC to spearhead North American expansion OPC has appointed Laura Kamrath as VP of Business Development, North America region. This new role demonstrates OPC’s increased focus on the US market, which is a key area of growth for the business.

OPC’s presence in the USA was established more than 10 years ago by Bill Roberts, President OPC USA, who has built an industry-leading reputation for well test analysis. Laura will build on the business created by Bill to expand services supplied to US clients to incorporate the full range of OPC technical services, consulting services and training. Laura started her career with Schlumberger in 2004 having graduated in Geology and French from Mount Holyoke College in Massachusetts. She gained experience in Measurements/Logging While Drilling (MWD/LWD) mostly offshore in the Gulf of Mexico and on land Gulf Coast, Montana and Alaska. She then moved into sales & marketing roles for Fugro and then INEXS, where she also spent a year in salt velocity modelling geophysics and attained an MBA at Rice University. She most recently worked with RPS in Business Development, Marketing and Project Management within their wellsite geology division.

Laura Kamrath VP Business Development USA +1 713 973 2151

Laura says “My new role with OPC gives me the opportunity to really make an impact. I will have the responsibility to grow and develop the US business while having the support of experienced colleagues and a sound business plan.” Outside of work, Laura is a keen cyclist and recently completed the 160 mile BP MS 150 ride from Houston to Austin, as a top fundraiser for Multiple Sclerosis. While the Houston summer will prevent quite such long rides, Laura still plans to cycle into work at the new OPC offices in the Allen Center, downtown Houston.


OPC Training Course Well Test Analysis SUMMARY Location: London Date: 22nd to 24th October 2013 Duration: 3 full days Cost: ยฃ1550 per person + VAT Aims: An understanding of the theory and practice of pressure transient analysis using analytical methods An understanding of the geological and fluid parameters which affect the results of pressure transient analysis Skills to interpret pressure transient analysis data for permeability and the various components of skin Skills to evaluate reservoir geometry and connected volume using boundaries and mobility / storativity models Experience in analysing real sets of test data The course materials and example datasets are not software specific thus can be used with any commercial software package. Use of the PIE well test software from WellTestSolutions (the software used by BP and Total among others worldwide) will be available for the course. The instructor for Well Test Analysis is Piers Johnson, Managing Director of OPC Ltd. Piers has 30 years of experience in all aspects of petroleum engineering, with specialisation in well testing and analysis. He commenced his career with Flopetrol Johnston Schlumberger, established Oilfield Production Consultants (OPC) Ltd. in 1987 and has consulted worldwide for all of the major international and state owned oil companies. He is a visiting professor in Well Testing at selected prestigious institutions including Imperial College, London and the Institut Franรงais du Petrole (ENSPM) in Paris where he lectures on the Masters course in Reservoir Geoscience and Engineering. Numerous OPC training courses and seminars are available in the subsurface disciplines. Courses are periodically hosted and open to all suitable industry professionals; or tailored to the needs of a specific client. All our training programmes are hosted and delivered by expert in-house and associate presenters, each of whom has an impressive level of industry knowledge and experience to their name. Some are run in collaboration with leading institutions, such as the Imperial College in London and the Institut Franรงais du Petrole (ENSPM). Some of our popular training courses include: Reservoir Engineering & Surveillance Well Test Supervision & Analysis Integrated Reservoir Management Petroleum Economics & Risk Analysis To find out more about these courses or other training enquiries, please email:





Please ensure you bring your own laptops with you for the course. Any required software will be supplied by OPC. Delegates are responsible for their own travel arrangements and accommodation.

• •

• •

Terminology and definitions Input data required, source, and quality control The inverse problem Darcy's law, radial diffusivity equation and its solution and applicability Time and space superposition Why superposition matters; the '3x' rule; drawdown and buildup type curve differences Radius of Investigation (RI) and 'tracing out' the reservoir

The concept of heterogeneity in well testing Effect of RI's components mobility and storativity Relating PTA to reservoir geology and geometry; reservoir symmetry Single, parallel and intersecting sealing faults; closed systems Linear and radial composite systems; aquifers and gas caps Double permeability (layered) and double porosity Material balance and connected volume modelling Considerations for gas wells


Contact Us •

Course information and registration: Telephone: UK +442074281111

Radial flow Decoupling skin and K from PI Horner and superposition plots Log-log plot / derivative plot Drawdown and build-up type curves Linear , bi-linear, spherical flow Skin types: mechanical, geometrical, rate-dependent, 'tubing' friction


• • •

Using 'transient' depletion and derivative overlays The '1/2' cycle rule and test duration Basics of deconvolution Estimating average reservoir pressure


Wellbore effects, gauge drift, phase segregation, the ‘1/2’ cycle rule Common rate and pressure input and setup error

USA +17139732151 Middle East +97444292381 Asia +77122996090


We hope you have enjoyed this newsletter. Let us know what you thought and what you’d like to know more about. Next edition due in November. Kazakhstan Astana T: +7 7172 501977 E: Atyrau T: +7 7122 305967 E:

Qatar Doha T: +974 4 4292381 E:

USA Houston T: + 1 713 973 2151 E:

UK Aberdeen T: +44(0)1224 329 1111 E: London T: +44(0)20 7428 1111 E:

Inside opc issue 16  

September 2013 edition of Inside OPC - with technical articles, features and news from OPC