Page 1

RIDGEBACK MARATHON

RIDGEBACK D-FORCE

INNOVATION HAS NO LIMITS Proud to be a Miner


TABLE OF CONTENTS

A Brief Introduction

Ridgeback Marathon Ridgeback D-Force

TM

1-2

TM

and

Comparison

3

Innovation, Evolution, Features and Benefits

4-5

Blast Hole Bits

6-10

Tungsten Carbide Industrial Bits

11

Mineral Exploration Bits

12

Steel Tooth Product Range

13-16

Pilot Bits

17

Additional Useful Data

18-21

CERTIFIED


DEDICATED TO DRILL BITS

Varel International is focused exclusively on producing world class drilling bits. We are committed to introducing drill bit innovation in partnership with our customers. We are a dedicated specialist drill bit manufacturer with more than 50 years experience.

Vision Statement “We will be recognized as a leading global drill bit company”

Mission Statement “We will deliver ever-increasing value to our customers and other stakeholders by exceeding industry standards for performance, service and innovation.”

Company Values We believe that people make a successful business. We are a team of passionate people who :

V alue

our employees for their dedication and innovation.

A re

R eliably

E thically

L ead

accountable to our stakeholders. provide products and service. interact with our customers, competitors, vendors and community.

in generating value for our customers.

1


After its founding in 1947, Varel International remained a family owned business until 1998, and is now majority owned by the Arcapita (USA) Group.

Development of Varel rock bits since

2000 The introduction of the patented Varel Ridgeback series produced the first generation of advanced technology features designed for longer life bearings, improved cutting structures, and the famous Ridgeback shirttail concept. All of these features greatly assists hole cleaning resulting in extended bit life.

2008 Building on the success of the patented Ridgeback series, the introduction of the new Ridgeback MarathonTM and Ridgeback D-ForceTM Series combines many of the existing field-proven features, plus a new high load SP1 bearing package, reinforced gage and shirttail protection features. These Ridgeback D-ForceTM features have been introduced to increase performance in highly abrasive conditions.

2


M a r a t ho n & D- Fo rce - f e a t u r e c o m p a r i son TM

TM

Backed by years of field-proven technology and expertise, Varel has become the leading provider of high performance drill bits. Our technological advances embrace the use of highly sophisticated computer technology, premium raw materials and thousands of "on the job man hours", all aimed at reducing our customers’ cost of drilling.

Ridgeback Marathon Blast Hole TM

HET carbide treatment

HET carbide treatment

Vented cones

Vented cones

Tougher carbide grades Tough & wear resistant cutting structure New SP1 advanced bearing design

Increased hole wall clearance New SP1 advanced bearing design New abrasion resistant carbide grades

Ridgeback

Sidewinder shirttail/gage protection

Ridgeback Marathon products contain new longer life bearings, additional gage protection, and improved cutting structure elements for use in high pull-down applications. TM

Ridgeback D-Force products contain new longer life bearings, heavy duty shirttails, and improved abrasion resitant tungsten carbide inserts for use in extremely abrasive applications. TM

D-Force

TM

Ridgeback Blast Hole

3


IN NOVAT I O N A N D E VO L U T I O N

INTRODUCING RIDGEBACK MARATHON AND RIDGEBACK D-FORCE SERIES

Air Passageways

TM

TM

Varel International is continually improving its’ series of three cone drill bits designed for the blasthole industry. The Ridgeback Marathon and Ridgeback D-Force series, incorporate the most advanced features available today in air circulation rock bits. TM

TM

Air Vent Holes Main Roller Bearing

RIDGEBACK DESIGN TECHNOLOGY

Carbide Shirttail Protection

Ball Bearing Pilot Bearing

New advances in computer technology have allowed Varel to develop proprietary rock bit design software that enables design changes to be introduced rapidly. This exclusive software aids the engineer with bit design analysis and includes such factors as drill operating parameters, bit geometry and mine lithology. By using this software, Varel’s engineers are able to predict the effects of design modifications and limit the risks associated with new product development.

4

Thrust Button

Thrust Faces HighTumbling Energy Tumbling High Energy


SERIES FEATURES AND BENEFITS

Advanced Bearing Design

RI D G EB A CK

R I D G EBACK

M A RATH O N

D - F OR CE

All Ridgeback MarathonTM and Ridgeback D-ForceTM rock bits incorporate bearings designed to minimize heating. The wear elements feature advanced materials to give the maximum bearing life under a wide variety of operating conditions.

Enhanced Cutter Design The Ridgeback

MarathonTM and Ridgeback D-ForceTM design process provides the highest penetration rates and longest life available.

Improved Thrust Capacity

Bearing thrust capacity is often the limiting factor in bearing life. Ridgeback MarathonTM bits feature an improved thrust face design which minimizes outward thrust wear to prolong bearing life.

Maximum Gage Protection SRT (Semi Round

High Energy Tumbling

TM

Top) tungsten carbide and welded hardmetal provide superior wear resistance to the shirttail area. This Sidewinder feature is particularly effective in unstable/ fractured formations and also during collaring.

Precision manufactured inserts are further processed for maximum toughness. Varel’s HET TM - High Energy TumblingTM process (patented) - gives the inserts a unique surface toughness that extends bit life.

I nnov at i on A dv ant ages Back Flow Valves

BFV’s are available for wet conditions on both TM Ridgeback Marathon and TM Ridgeback D-Force models.

• Longer bearing life • Increased penetration • Added gage penetration • Reduced heat generation • Larger cuttings • Less dust

Vented Cones

Vented cones are standard in all TM Ridgeback Marathon and Ridgeback D-ForceTM series bits 9” and larger in diameter. Vented cones allow a continuous air flow throughout the bearings to provide better cooling and cleaning. See page 20 for recommended nozzle sizes when using bits with vented cones.

5


SOFT FORMATION

INSERT BITS

All soft formation bits are designed with aggressive cutter profiles to provide extremely high penetration rates.

RB30/DF30

series

COMPRESSIVE STRENGTHS: 2,000 - 10,000 (psi)

DRILLING SPEEDS:

70 to 120 rpm

JET CIRCULATION:

All sizes

DRILLING WEIGHTS:

2,000 to 4,000

(lbs/inch of bit diameter)

RB40/DF40

D-FORCE : For use in more abrasive formations containing sand, silica, quartz, most ignious formations and most gold bearing formations.

series

COMPRESSIVE STRENGTHS: 5,000 - 15,000 (psi)

DRILLING SPEEDS:

70 to 120 rpm

JET CIRCULATION:

All sizes

DRILLING WEIGHTS:

2,000 to 4,500

(lbs/inch of bit diameter)

DF43

APPLICATIONS: MARATHON : For use in less abrasive formations such as shales, limestones, carbonates, most metamorphic formations and most copper bearing formations.

APPLICATIONS: MARATHON : For use in less abrasive formations such as shales, limestones, carbonates, most metamorphic formations and most copper bearing formations. D-FORCE : For use in more abrasive formations containing sand, silica, quartz, most ignious formations and most gold bearing formations.

series

COMPRESSIVE STRENGTHS: 8,500 - 23,500 (psi)

DRILLING SPEEDS:

70 to 120 rpm

JET CIRCULATION:

All sizes

DRILLING WEIGHTS:

2,000 to 5,000

(lbs/inch of bit diameter)

APPLICATIONS: D-FORCE : For use in more abrasive formations containing sand, silica, quartz, most ignious formations and most gold bearing formations.

Cutting structures may vary from those shown where RB and DF series bits share the same series number (i.e. RB40/DF40). The Ridgeback D-ForceTM series includes many of our Ridgeback MarathonTM features with additional gage protection and a heavy duty Sidewinder leg which is designed for extremely abrasive applications and drilling conditions where difficult hole cleaning, or extreme formations, require maximum shirttail protection.

The Ridgeback MarathonTM series contains new longer life bearings, additional gage protection, and improved cutting structure elements for use in high pull-down applications.

Ri d g e b a ck

6

D - F o rc e

( Sid ew in d er)


MEDIUM FORMATION

INSERT BITS

Medium formation bits are most commonly used in the mining industry, and provide long bearing life with additional insert strength for consolidated formations.

RB50

series

STRENGTHS:

10,000 - 30,000 (psi)

DRILLING SPEEDS:

70 to 120 rpm

JET CIRCULATION:

All sizes

DRILLING WEIGHTS:

2,500 to 5,000

(lbs/inch of bit diameter)

APPLICATIONS: MARATHON : For use in less abrasive formations such as shales, limestones, carbonates, most metamorphic formations and most copper bearing formations.

RB53/DF53

series

COMPRESSIVE STRENGTHS: 15,000 - 35,000 (psi)

DRILLING SPEEDS:

70 to 120 rpm

JET CIRCULATION:

All sizes

DRILLING WEIGHTS:

2,500 to 5,000

(lbs/inch of bit diameter)

RB60/DF60

APPLICATIONS: MARATHON : For use in less abrasive formations such as shales, limestones, carbonates, most metamorphic formations and most copper bearing formations. D-FORCE : For use in more abrasive formations containing sand, silica, quartz, most ignious formations most gold bearing formations.

series

COMPRESSIVE STRENGTHS: 25,000 - 45,000 (psi)

DRILLING SPEEDS:

60 to 100 rpm

JET CIRCULATION:

All sizes

DRILLING WEIGHTS:

3,000 to 6,000

(lbs/inch of bit diameter)

APPLICATIONS: MARATHON : For use in less abrasive formations such as shales, limestones, carbonates, most metamorphic formations and most copper bearing formations. D-FORCE : For use in more abrasive formations containing sand, silica, quartz, most ignious formations most gold bearing formations.

Cutting structures may vary from those shown where RB and DF series bits share the same series number (i.e. RB40/DF40). The Ridgeback D-Force series includes many of our Ridgeback Marathon features with additional gage protection and a heavy duty Sidewinder leg which is designed for extremely abrasive applications and drilling conditions where difficult hole cleaning, or extreme formations, require maximum shirttail protection.

The Ridgeback MarathonTM series contains new longer life bearings, additional gage protection, and improved cutting structure elements for use in high pull-down applications.

Ri d g e b a ck

D - F o rc e

( Sid ew in d er )

7


MEDIUM HARD FORMATION

INSERT BITS

All medium hard formation bits are designed with aggressive cutter profiles to provide extremely high penetration rates when higher pulldown is needed.

RB63/DF63

series

COMPRESSIVE STRENGTHS: 27,500 - 47,500 (psi)

DRILLING SPEEDS:

60 to 100 rpm

JET CIRCULATION:

All sizes

DRILLING WEIGHTS:

3,000 to 6,000

(lbs/inch of bit diameter)

APPLICATIONS: MARATHON : For use in less abrasive formations such as shales, limestones, carbonates, most metamorphic formations and most copper bearing formations.

RB67/DF67

series

COMPRESSIVE STRENGTHS: 30,000 - 50,000 (psi)

DRILLING SPEEDS:

60 to 100 rpm

JET CIRCULATION:

All sizes

DRILLING WEIGHTS:

3,000 to 6,500

(lbs/inch of bit diameter)

APPLICATIONS: MARATHON : For use in less abrasive formations such as shales, limestones, carbonates, most metamorphic formations and most copper bearing formations. D-FORCE : For use in more abrasive formations containing sand, silica, quartz, most ignious formations most gold bearing formations.

Cutting structures may vary from those shown where RB and DF series bits share the same series number (i.e. RB40/DF40).

The Ridgeback D-ForceTM series includes many of our Ridgeback MarathonTM features with additional gage protection and a heavy duty Sidewinder leg which is designed for extremely abrasive applications and drilling conditions where difficult hole cleaning, or extreme formations, require maximum shirttail protection.

The Ridgeback MarathonTM series contains new longer life bearings, additional gage protection, and improved cutting structure elements for use in high pull-down applications.

Ri d g e b a c k

8

D - F o rc e

( Sid ew in d er)


HARD/VERY HARD FORMATION

INSERT BITS

All hard formation bits are designed with tough low extension cutter profiles to provide maximum durability in hard formations.

RB70/DF70

series

STRENGTHS:

35,000 - 60,000 (psi)

DRILLING SPEEDS:

50 to 90 rpm

JET CIRCULATION:

All sizes

DRILLING WEIGHTS:

4,000 to 7,500

(lbs/inch of bit diameter)

RB80G

APPLICATIONS: MARATHON : For use in less abrasive formations such as shales, limestones, carbonates, most metamorphic formations and most copper bearing formations. D-FORCE : For use in more abrasive formations containing sand, silica, quartz, most ignious formations most gold bearing formations.

series

COMPRESSIVE STRENGTHS: 50,000 (psi) and Higher

DRILLING SPEEDS:

40 to 70 rpm

JET CIRCULATION:

All sizes

DRILLING WEIGHTS:

5,000 to 8,000

(lbs/inch of bit diameter)

APPLICATIONS: MARATHON : For use in less abrasive formations such as shales, limestones, carbonates, most metamorphic formations and most copper bearing formations.

Cutting structures may vary from those shown where RB and DF series bits share the same series number (i.e. RB40/DF40).

The Ridgeback D-ForceTM series includes many of our Ridgeback MarathonTM features with additional gage protection and a heavy duty Sidewinder leg which is designed for extremely abrasive applications and drilling conditions where difficult hole cleaning, or extreme formations, require maximum shirttail protection.

The Ridgeback MarathonTM series contains new longer life bearings, additional gage protection, and improved cutting structure elements for use in high pull-down applications.

Ri d g e b a c k

D - F o rc e

( Sid ew in d er )

9


I N SE RT B IT PR OD UCT L INE

RIDGEBACK MARATHON

TM

Diameter

SOFT 1

2

MEDIUM 3

HARD

lbs

kg

3 1/2

42

19

3 1/2

46

21

3 1/2

58

26

4 1/2

76

35

4 1/2

96

43

6 5/8

145

66

RB67

6 5/8

157

72

RB60

RB67

6 5/8

193

88

RB53

RB60

RB67

6 5/8

225

102

RB53

RB60

RB67

6 5/8

292

134

7 BECO

580

264

mm

6 1/4

159

6 3/4

171

RB40

RB50

7 3/8

187

RB40

RB50

7 7/8

200

RB30

RB40

RB50

RB53

RB60

9

229

RB30

RB40

RB43

RB53

RB60

9 7/8

251

RB30

RB40

RB50

RB53

RB60

10 5/8

270

RB30

RB40

RB53

RB60

11

280

RB53

12 1/4

311

13 3/4

349

16

406.4

1

2

3

1

RB40

RB70

RB63

RB67 RB63

7 7/8

200

9

229

9 7/8

251

10 5/8

270

11

280

12 1/4

311

16

406.4

RB70

RB70

RB80G

SOFT 1

2

MEDIUM 3

1

DF30

DF40

DF60

DF43

DF40

DF60

DF40

DF60 DF53

DF40

HARD 3

DF60

DF43 DF30

2

SERIES

1

2

DF67 DF63

DF67

DF70

Pin Size Approx Wt 3

Inches

lbs

kg

3 1/2

42

19

4 1/2

76

35

4 1/2

96

43

6 5/8

145

66

DF60

DF63

DF67

6 5/8

157

72

DF60

DF63

DF67

6 5/8

193

88

DF67

6 5/8

225

102

DF67*

7 BECO

580

264

DF60

*With 7" BECO pin The above product range represents the bits which were available when this catalogue was published. Varel is continually expanding and developing its range of products. For an updated availability list, please contact a Varel sales representative/agent, or consult our Web site at -WWW.VARELINTL.COM

10

RB80G

RB60•

Diameter 159

3

RB70

RB60

TM

6 3/4

2

RB53

RIDGEBACK D-FORCE mm

Pin Size Approx Wt Inches

Inches

Inches

SERIES


I N DU ST RI A L BIT PR OD UCT L INE

TUNGSTEN CARBIDE INDUSTRIAL BITS Diameter Inches

mm

2 15/16 - 3

75-76

3 7/8

SOFT 1

2

MEDIUM 3

1

2

HARD 3

1

2

Pin Size Approx Wt 3

lbs

kg

N Rod

8

3.6

98

2 3/8

10

4.5

4

101

2 3/8

11

4.75

4 1/4

108

2 3/8

12

5.5

4 1/2

114

2 3/8

13

5.8

4 3/4

121

2 7/8

15

6.8

4 7/8

123

2 7/8

16

7.1

5 1/8

130

2 7/8

17

7.7

5 5/8

143

3 1/2

27

12.2

5 7/8

149

3 1/2

28

12.7

6

152

3 1/2

35

15.9

6 1/4

159

3 1/2

36

16.3

M60

Please note that all QMC series products may be slightly oversize. All DW series products are made strictly to API tolerance standards.

DW9

DW53ET

DW7

DWH

11


M I N E RA L EXPL OR ATION BITS Varel has developed a range of reverse circulation bits with various bearing packages. These bits are suitable for soft/medium formation drilling and have: • Open non-sealed roller bearings. • Fully sealed compensated journal bearings.

BIT AVAILABILITY Size of Bit

Type

Formation

Bearing

Varel provides a range of products for reverse circulation applications. These bits are developed to provide exceptional performance in a wide variety of formations typically encountered during mineral exploration. The center hole is the maximum diameter possible for superior hole cleaning and cuttings retrieval. All RX and RC bits are precision machined to work with most existing R/C systems.

5 1/8"

DW53ET

MEDIUM

OPEN

5 1/4"

RX53

MEDIUM

OPEN

5 3/8"

RX53

MEDIUM

OPEN

5 1/2"

RX53

MEDIUM

OPEN

3 7/8"

CH24

SOFT

SEALED*

Products featuring both sealed and open bearings are available. Varel fullysealed bearing products for reverse circulation applications feature fully pressure compensated, non serviceable lubrication supplied to the industry’s most sophisticated journal bearing. The bearing features hardmetal inlays on all contact surfaces with silver-plated cone bearings, specially formulated seal compounds, and high-temperature lubricant. The bearings and seals are developed for long life.

4 3/4"

CH24

SOFT

SEALED*

4 3/4"

CH35

MEDIUM

SEALED*

O p e n b e a r i n g p r o d u c t s f e a t u r e p r e c i s i o n r o l l e r bearings with special thrust elements to prevent axial wear. The cones are retained by ball bearings and the pilot pin features hardmetal inlays against a tool steel bushing. Regardless of bearing type, the cutting structures on all reverse c i r c u l a t i o n p r o d u c t s a r e d e s i g n e d t o p r o v i d e a combination of fast penetration and durability. These bits consistently provide the lowest cost per foot of drilled hole in mineral exploration applications.

4 3/4"

ETD48

HARD

SEALED*

5"

RC537

MEDIUM

SEALED*

5 1/8"

RC537

MEDIUM

SEALED*

5 1/4"

RC537

MEDIUM

SEALED*

5 3/8"

RC537

MEDIUM

SEALED*

5 1/2"

RC537

MEDIUM

SEALED*

5 5/8"

CH34

MEDIUM

SEALED*

5 3/4"

CH34

MEDIUM

SEALED*

5 7/8"

CH34

MEDIUM

SEALED*

6"

CH34

MEDIUM

SEALED*

6 1/8"

CH34

MEDIUM

SEALED*

6 1/4"

CH34

MEDIUM

SEALED*

6 1/2"

CH34

MEDIUM

SEALED*

6 3/4"

V537

MEDIUM

SEALED*

* Fully sealed bearing with compensator system.

Our availability chart lists the most popular diameters and cutting structures we currently manufacture for reverse circulation applications. Other cutting structures and diameters may be available upon request.

5 1/2” - RC537

12


STEEL TOOTH BIT PRODUCT LINE Diameter Inches mm 2 7/8

SOFT 1

2

MEDIUM 3

1

2

HARD 3

1

2

Pin Size 3

4

1.8

N Rod

4

1.8

N Rod

4 1/4

1.9

2 3/8

9

4.1

2 3/8

9

4.1

73

LH1

N Rod

2 15/16

75

LH1

3 1/4

79-82

3 1/2-3 5/8 89-92 3 3/4

L2

95

L1

LH1

L2

3 7/8-4 1/8 98-105

Approx Wt lbs kg

2 3/8

9

4.1

4 1/4

108

L2

LH1

2 3/8

10

4.5

4 1/2

114

L2

LH1

2 3/8

11

5

4 5/8

117

L2

2 7/8

11

5

4 3/4

121

L2

2 7/8

16

7.3

L2

2 7/8

16

7.3

L2

2 7/8

17

7.7

L2

L1

LH1

5

123-127

5 1/8

130-133

5 1/2

140

L2

2 7/8

17

7.7

5 5/8

143

L2

3 1/2

22

10

5 3/4

146

L2

3 1/2

22

10

5 7/8

149

L2

3 1/2

22

10

3 1/2

26

11.8

3 1/2

26

11.8

V3M0 V3S0

6

152

L2

6 1/8

156

L2

6 1/4

159

L2

3 1/2

29

13.2

6 1/2

165

L2

3 1/2

29

13.2

6 3/4

171

L2

3 1/2

33

15

7 7/8

200

L2

4 1/2

62

28

12 1/4

311

L121*

6 5/8

200

91

13 3/4

349

L121*

6 5/8

292

133

17 1/2

445

L111*

6 5/8 or 7 5/8

450

204

20

508

L111*

6 5/8 or 7 5/8

860

391

22

559

L111*

7 5/8

891

404

24

610

L111*

7 5/8

1125

510

26

660

L111*

7 5/8 or 8 5/8

1300

589

28

711

L113*

7 5/8 or 8 5/8

1420

645

34

863

L3A

7 5/8 or 8 5/8

2200

1000

36

914

L3A

7 5/8 or 8 5/8

2400

1100

L1

* JET BITS The above chart represents commonly available sizes and types. Varel International does produce other sizes and types of rock bits which do not appear on this list. Please consult your local representative or visit our Web site. WWW.VARELINTL.COM If you have custom requirements for a specific application, please contact your local sales representative/agent.

13


SOFT FORMATION

STEEL TOOTH BITS

Varel’s soft formation steel tooth bits have long aggressive forged teeth with maximum offset to give high penetration rates.

L111 COMPRESSIVE STRENGTHS: 500 to 3,000 (psi) DRILLING SPEEDS: 60 to 150 rpm JET CIRCULATION: all sizes DRILLING WEIGHTS: 2,000 to 5,000 (lbs/inch of bit diameter) GAGE TYPES: “A” Tooth FORMATIONS: Soft limestones, soft clays, red beds, soft shales, shells and other formations with relatively low compressive strengths. FEATURES: Long, slim, widely spaced teeth. All teeth are hard faced. Skewed cone action for high penetration rates.

L111

L121 COMPRESSIVE STRENGTHS: 500 to 3,500 (psi) DRILLING SPEEDS: 60 to 150 rpm JET CIRCULATION: all sizes DRILLING WEIGHTS: 2,000 to 5,500 (lbs/inch of bit diameter) GAGE TYPES: “A” Tooth FORMATIONS: Soft limestones, soft clays, red beds, soft shales, shells and other formations with relatively low compressive strengths.

FEATURES: Long, slim, widely spaced teeth with additional hard facing.

Skewed cone action for high penetration rates.

L121

V3MO COMPRESSIVE STRENGTHS: 1,000 to 5,000 (psi) DRILLING SPEEDS: 50 to 100 rpm JET CIRCULATION: 5 1/8” and larger DRILLING WEIGHTS: 2,000 to 5,000 (lbs/inch of bit diameter) GAGE TYPES: “A” Tooth FORMATIONS: Engineered for rugged drilling in a wide variety of formations.

FEATURES: All teeth are hard faced with extra heavy deposits of tungsten car-

bide for long life. Additional gage hard metal assures more protection for the shirttails. Spacing and angle of teeth allow for durability and long life.

V3M0

14


MEDIUM & HARD FORMATION

STEEL TOOTH BITS

Medium series bits have “A” or “T” teeth for wear resistance. Hard formation bits have “L” or “T” shaped heel row teeth for hard formations, double “T” heel row teeth for hard and abrasive formations.

L2 COMPRESSIVE STRENGTHS: 4,000 to 10,000 (psi) DRILLING SPEEDS: 35 to 85 rpm ALL REGULAR CIRCULATION: 2 7/8” and larger DRILLING WEIGHTS: 3,000 to 6,000 (lbs/inch of bit diameter) GAGE TYPES; “A” Tooth FORMATIONS: Wide range of medium formations such as altered limestones, shales, anhydrite and other formations with medium compressive strengths.

FEATURES: Moderately skewed cone design. Teeth hard-faced on one flank to resist abrasion. Vented “A” type gage gives high rates of penetration.

L2

L1 COMPRESSIVE STRENGTHS: 8,000 - 18,000 (psi) DRILLING SPEEDS: 35 to 75 rpm REGULAR CIRCULATION: All sizes 3,500 to 6,500 DRILLING WEIGHTS: (lbs/inch of bit diameter) GAGE TYPES: ‘A’ Tooth FORMATIONS: Specifically designed for fast penetration in formations that are hard, but not particularly abrasive.

FEATURES: Designed to conform to latest drilling techniques requiring heavier weights. Similar in design to the LH1, but does not have webbed heel row.

L1

LH1 COMPRESSIVE STRENGTHS: 9,000 - 20,000 (psi) DRILLING SPEEDS: 30 to 65 rpm REGULAR CIRCULATION: All sizes 3,500 to 7,000 DRILLING WEIGHTS: (lbs/inch of bit diameter) GAGE TYPES: Double ‘T’ FORMATIONS: Hard formations such as pyrite, chert,dolomites,

granite porphyry and other formations which have high compressive strengths and are abrasive.

FEATURES: Closely spaced, strong short teeth for maximum crushing and

chipping.

LH1

15


FE AT U RE S

Regular Center Fluid Circulation

Varel regular circulation bits provide efficient circulation of fluid through the center of the bit to clean the teeth and the bottom of the hole. Available in full opening or three drilled hole courses.

Whether you are using air, water, foam or mud for circulation purposes, Varel has a full range of bits suitable for your needs.

Regular Air Circulation

Varel air blast circulation bits provide a balanced supply of air to the bearings for cooling. A balanced supply of air also is directed to clean the cutters and the bottom of the hole. Back flow valve is available with this design.

Jet Circulation Fluid or Air

Varel jet circulation bits are engineered for use with high pressure fluid or air. The precision nozzles direct the velocity of the fluid or air at the bottom of the hole for efficient cleaning.

Optional Features 1. Jet Circulation: Specify air or fluid circulation. 2. Regular (center) Circulation: Specify fluid or air circulation and, full hole or orifice plate. 3. Reverse Circulation: Precision machined to customer specifications. 4. BECO Pin thread connection.

Forged Teeth, unique to Varel Varel pioneered the research and development of forged teeth for steel tooth rotary cone bits. This technique, illustrated in the chemically etched section above, is a recognized advance in metallurgical design, resulting in stronger, uniformly compressed and unbroken flow lines in bit teeth. These stronger teeth produce longer bit life and faster penetration.

16


SEALED BEARING PILOT HOLE BITS Premium Sealed Bearing Pilot Hole Bits CURRENT PILOT BIT AVAILABILITY

Varel International’s oilfield and mining experience provides a selection of sealed bearing journal bits designed for drilling the most demanding raise bore pilot holes, blind bore pilot holes, and underground drill and blast holes. Each bit is designed with a premium sealed bearing system including a pressure compensator. The premium bearing package features advanced metallurgy with frictional elements silver-plated to reduce frictional heat generation and provide resistance to galling under high loads. O-ring seals made from a proprietary HSN elastomer provide extremely long seal life. The PH80 series features blunt dome-shaped inserts to provide a durable cutting structure for maximum crushing and chipping action while minimizing wear. Varel’s PH60 bits utilize conical and/or chisel shaped inserts for increased penetration rates in softer formations. Extra hardmetal and carbide inserts are installed in the surface of the shirttail to provide superior seal protection.

Bit Sizes

Bit Type

15"

PHR80*

13 3/4"

PH80

12 1/4"

PHR80* - PH80

11"

PH60 - PH80

9"

PH80

* Sealed roller bearing bit for Boxhole applications. All Varel premium pilot bits incorporate specially formulated highly saturated nitrile elastomers and high temperature lubricants. (New diameters and models are under development. Please consult your nearest representative.)

12 1/4” - PH80

17


CONVERSION TABLE DEPTH

WEIGHT ON BIT

NOZZLE SIZE

VOLUME

CIRCULATION RATE

ANNULAR VELOCITY

PRESSURE

MUD WEIGHT (density)

TORQUE

AREA

18

TO CONVERT

INTO

MULTIPLY BY

feet

meters

0.3048

metres

feet

3.2808

inches

millimeters

25.4

millimeters

inches

0.0394

pounds

decanewtons

0.4448

decanewtons

tonne (metric)

2.2481

tonne

pounds

0.0004536

pounds

kilograms

0.4536

kilograms

pounds

2.205

32nds

millimeters

0.7938

millimeters

32nds

1.2598

barrels

cubic meters

0.1590

cubic meters

barrels

6.290

U.S. gallons

cubic meters

0.003785

cubic meters

U.S. gallons

264.2

U.S. gallons

liters

3.7854

liters

U.S. gallons

0.2642

barrels/min

gallons/min

42

gallons/min

barrels/min

0.02381

gallons/min

liters/min

3.7854

liters/min

gallons/min

0.2642

feet/min

meters/min

0.3048

meters/min

feet/min

3.2808

psi

kilopascals

6.8947

kilopascals

psi

0.14504

psi

megapscals

0.006895

megapascals

psi

145.038

psi

atm

0.06804

atm

psi

14.696

psi

bars

0.06895

bars

psi

14.5038

psi

kilogram/sq cm

0.07031

kilogram/sq cm

psi

14.2233

pound/gallon

kilogram/cubic meter

119.829

kilogram/cubic meter

pound/gallon

0.008345

pound/gallon

specific gravity

0.119829

specific gravity

pound gallon

8.3452

pound/gallon

psi/1000 ft

51.948

psi/100 ft

pound gallon

0.01923

foot pound

newton meters

1.3558

newton meters

foot pound

0.7376

square inches

square millimeters

645.16

square millimeters

square inches

0.00155


C H A RT S FO R MAXIMUM BIT L IF E VAREL INSERT BIT COMPARISON AND HARDNESS TABLE

34.5 4

51.7 6

69.0 7

86.2 8

103.4 120.7 137.9 155.1 172.4 189.6 206.8 224.1 241.3 258.6 275.8 293.0 310.3 327.5 344.7 362.0 379.2 396.5 413.7 430.9 448.2 465.4 482.6 10 11 12 13 14 15 16 17 18 18 19 20 21 22 23 23 24

SCHIST (SOFT)

SANDSTONE (SOFT)

LIMESTONE (SOFT)

LIMESTONE (HARD)

CONGLOMERATE

SANDSTONE (HARD)

S O F T

QUARTZITE (HARD)

DIABASE (DOLERITE)

GRANITE

SLATE

DIORITE

BASALT (HARD)

17.2 2.5

AMPHIBOLITE

MPA PTO

GNEISS (AVERAGE)

7500 10000 12500 15000 17500 20000 22500 25000 27500 30000 32500 35000 37500 40000 42500 45000 47500 50000 52500 55000 57500 60000 62500 65000 67500 70000

GABBRO

5000

QUARTZITE (SOFT)

2500

FORMATION

REPRESENTATIVE ROCK COMPRESSIVE STRENGTH in psi / mpa / protodjakonov scales PSI

30 40

Varel Ridgeback Marathon Ridgeback D-Force Series Insert Bits

43

M E D I U M

TM

TM

50 53 60 63

H A R D

67 70 80

VAREL STEEL TOOTH BIT COMPARISON AND HARDNESS TABLE 2000

3000

4000

5000

6000

7000

8000

9000 10000 11000 12000 13000 14000 15000 16000 17000 18000 19000

MPA

6.9

13.8

20.7

27.6

34.5

41.4

48.3

55.2

62.1

82.7

89.6

96.5

PTO

1

2

3

4

6

6

7

8

9

9

10

10

11

11

12

TUFF

SANDSTONE (SOFT)

LIMESTONE (SOFT)

BASALT (SOFT)

LIMESTONE (HARD)

CONGLOMERATE

DOLOMITE

SHALE (SOFT)

ANDESITE

SANDSTONE (HARD)

MARBLE

DIORITE

SCHIST (HARD)

FORMATION

1000

SCHIST (SOFT)

REPRESENTATIVE ROCK COMPRESSIVE STRENGTH in psi / mpa / protodjakonov scales PSI

S O F T M E D I U M H A R D

69.0

75.8

103.4 110.3 117.2 124.1 131.0

L111 V3MO

Varel Steel Tooth Bits

L2

L1 LH1

19


U SE FU L OPER ATIONAL D ATA Tips for optimizing drill bit performance

Nozzle Hole Area Chart Hole Size in.

mm

Area/1 Hole Sq. in. mm

2

Area/3 Holes Sq. in.

mm

2

1/4

6.35

.049

31.62

.147

94.84

9/32

7.14

.062

40.00

.186

120.01

5/16

7.93

.076

49.04

.228

147.11

11/32

8.73

.093

60.00

.279

180.01

3/8

9.52

.110

70.97

.330

219.92

13/32

10.31

.130

83.88

.390

251.63

7/16

11.11

.150

96.78

.450

290.34

15/32

11.90

.172

110.97

.516

332.92

1/2

12.70

.196

126.46

.588

379.38

17/32

13.49

.222

143.23

.666

429.70

9/16

14.28

.248

160.01

.745

480.67

5/8

15.87

.306

197.43

.918

592.29

11/16

17.46

.372

240.01

1.116

720.04

3/4

19.05

.442

285.18

1.326

855.54

7/8

22.22

.601

387.77

1.803

1163.30

1

25.40

.785

506.48

2.355

1519.45

1 1/8

28.57

.993

640.68

2.985

1925.92

1 1/4

31.75

1.228

792.31

3.684

2376.92

Nozzle Size Adjustment For Vented Cones Non-vented nozzle size (one)

Nozzle size for vented cones (one)

Keep rotating the bit, and turn on the air before the bit touches the ground, and keep the air on until the bit is out of the hole. If the bit is to stay in the hole while adding drill steel, blow the hole clean for 60 seconds prior to turning off the air.

2.

When purchasing a new drill specify compressors with adequate capacity. Don’t forget the altitude factor when sizing the compressor. Often 7,000 to 10,000 linear feet per minute in return air velocity is required to properly clean the hole, particularly with heavier or larger cuttings.

3. Inspect the rock bit after each hole and record the condition of the rock bit at regular intervals. 4. Hot cones may indicate obstruction of the air passage to the bearings. 5. Pressure gage increases may indicate air passages are plugging. 6. An increase in air pressure may indicate unwanted restrictions in the air system. A decrease in air pressure may indicate leakage in the air system. 7. Accidental dropping of the bit and drill string can damage bearings and/or cones. 8. The I.D. (inside diameter) of the pin and box connections of the drill string should be the same as or larger than the I.D. of the pin on the rock bit. This will reduce the pressure drop loss across the drill string to the lowest possible psi. 9. Avoid early bit failures by refraining from using bent drill steel and excessively worn drill steel, stabilizers, deck bushings or shock subs. 10. When making up the rock bit use slow rotation and ensure that the drill string and rock bit mate properly shoulder to shoulder. Monitor the process carefully in order to avoid cross threading. 11. Use proper tool joint lubrication to maintain connections. 12. Use only the minimum amount of water required to suppress the dust. 13. Use the factory recommended weight and rotation speeds to accommodate the formations being drilled. 14. Rotary speed should be decreased as down pressure is increased and down pressure decreased as rotary speed is increased. 15. Accurate information is valuable knowledge. Always record footage drilled, time in the hole, rpm, weight on bit, psi, formation drilled and any unusual drilling conditions. (Water in the hole, broken formations, etc.) 16. Form drilling process improvement teams with your key suppliers. Establish improvement goals and measure progress.

Bit size 9"

Bit size 9 7/8" - 13 3/4"

1/2"

7/16"

7/16"

9/16"

1/2"

1/2"

5/8"

9/16"

9/16"

11/16"

5/8"

5/8"

3/4"

3/4"

11/16"

13/16"

13/16"

3/4"

7/8"

7/8"

13/16"

15/16"

15/16"

7/8"

B

= Total bit price

1"

1"

15/16"

R

= Operating cost per hour for the drill rig expressed in dollars per hour

F

= Total life of the rock bit expressed in either feet or meters

P

= Penetration rate of the rock bit expressed as feet or meters per hour

Unique feature at Varel International are vented cones.

Bits with vented cones have significantly more airflow through the bearings than standard bits. The nozzle size should be reduced in order to maintain suitable back pressure for proper cooling and cleaning. This chart gives the proper nozzle sizes to use with bits with vented cones.

20

1.

Total Drilling Cost TDC = B + R F P TDC = Total drilling cost per foot or meter drilled


U SE FU L O PER ATIONAL D ATA

BIT AIR PRESSURE DROP CHART Bit Size Range in.

Full Air Course Diameter

Jet Nozzle Diameter 3 Each

mm in.

mm

in.

1/2 5/8 3/4 7/8 1 3/4 7/8 1 1 1/8 5/8 3/4 7/8 1 1 1/8

12.70 15.87 19.05 22.22 25.40 19.05 22.22 25.40 28.57 15.87 19.05 22.22 25.40 28.57

3/4 7/8 1 10 5/8 270 1 1/8 1 3/8 to 17 1/2 445 1 1/2 2

19.05 22.22 25.40 28.57 34.92 38.10 50.80

5/16 3/8 7/16 1/2 9/16 7/16 1/2 9/16 5/8 3/8 7/16 1/2 9/16 5/8 3/4 7/16 1/2 9/16 5/8 3/4 7/8 1 1/8

5 3/8 137 to 6 3/4 171

7 3/8 187 to 7 7/8 200

9 229 to 9 7/8 251

Air Pressure Drop (pounds per square inch) Bits with various air course diameters or jet nozzle sizes Air Volume Delivered Cubic Feet Per Minute

mm 400 500 7.93 9.52 11.11 12.70 14.28 11.11 12.70 14.28 15.87 9.52 11.11 12.70 14.28 15.87 19.05 11.11 12.70 14.28 15.87 19.05 22.22 28.57

45 36 30 26 21 24

29 22

55 46 37 32 26 31 24

39 30 24

600

700

800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2600 2800 3000

65 54 44 36 32 38 30 23

75 64 51 44 37 45 36 29 24 57 45 36 29 22

84 72 60 51 44 52 42 35 29 65 53 42 35 28

28 21

33 26 22

49 38 30 23

22

81 68 57 50 58 48 40 34 73 61 48 41 35 22 38 30 26 22

76 64 54 66 54 46 39 80 68 56 46 39 25 44 36 30 25

82 70 59 72 62 52 44 75 63 52 44 29 49 41 34 28

76 65 78 70 58 50 82 69 57 49 34 55 46 37 30 22

82 70 84 79 64 55

74 62 52 39 61 50 41 34 25 20

76

82

87 70 60

76 65

83 71

80 67 56 43 66 55 45 37 28 22

71 61 46 72 59 49 41 31 24

76 65 50 78 63 53 45 34 26

76

82

81 69 53

73 57

77 60

81 64

68 58 49 37 28

73 62 52 40 30

78 66 56 43 31

70 60 45 33

67

71

74

78

82

75 64 48 36 20

67 51 38 22

71 54 40 28

75 57 43 30

60 45 30

64 47 32

68 50 34

In addition to adequate return air velocities, the pressure drop across the bit must be controlled to obtain the optimum bearing life. Pressure drop across the bit should be maintained in excess of 30 psi. Two (2) to ten (10) psi should be added for losses in the system ahead of the bit. For optimum bit life nozzles should be selected to hold pressure near the maximum allowable on the compressor.

Helpful Hole Cleaning Information For the most effective hole cleaning a minimum bailing velocity of 6000 feet per minute is considered desirable. This volume is calculated for the most common bit and pipe sizes. For dense materials, this volume should be increased in order to yield optimum cleaning efficiency. The simple formula Q=AV can be applied to determine the volume flow of air (Q) necessary to give the desired velocity (V). (A) is the area of the hole through which the cuttings-laden air flows. This area is the area of the hole less the area filled by the drill pipe.

Bailing velocity BV = BV = ACFM = 183.3 = D = d =

183.3 x ACFM D 2 _ d2 Bailing velocity(feet per minute) Actual cubic feet of free air per minute delivered Factor for conversion Diameter of the hole being drilled. (inches) Outside diameter of the drill pipe being utilized. (inches)

21


SALES

OFFICES

WORLDWIDE:

VAREL INTERNATIONAL CORPORATE HEADQUARTERS 1434 Patton, Suite 106, Carrollton, Texas 75007 Mailing address: P.O. Box 540157, Dallas, Texas 75354-0157 Phone: +1-972-242-1160 Fax: +1-972-242-8770 Email: customerservice@varelintl.com Watts: 1-800-VARELCO (827-3526) MEXICO VAREL DE MEXICO, S.A DE C.V. 3a. Y Michoacan #310 Sur Fraccionamiento Moderno, H. Matamoros Tamaulipas, Mexico C.P. 87380 Phone: +52-868-8170467 Fax: +52-868-8172106 Email: JSarachaga@Varelintl.com

SOUTH AMERICA VAREL INTERNATIONAL Ind. L.P. Sucursal del Peru Las Poncianas 105/107, La Molina Vieja Lima 12, Peru Phones: +51-1-365-2529 / 365-5178 Fax: +51-1-365-8305 Cellular: +51-1-9999-60283/+51-1-994565587 RPM # 297165 Email: Servicioalcliente@Varelintl.com Email: VCobena@Varelintl.com

ASIA-PACIFIC VAREL INTERNATIONAL (Australia Pty Ltd) Riseley Corporate Centre Suite 31, 135, Riseley Street Booragoon, WA 6154 Australia. Phone: +61-8-9315-9999 Fax: +61-8-9315-9800 Email: varelaustralia@varelintl.com

7146 - 082008

CERTIFIED

Visit us at WWW.VARELINTL.COM


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