Utf 8''varel dforce-catalog_web_1

Proud to be a Miner

INNOVATION HAS NO LIMITS

RIDGEBACKMARATHON

RIDGEBACKD-FORCE

A Brief

Introduction

Ridgeback MarathonTM

and

Ridgeback D-ForceTM Comparison

Innovation, Evolution,

Features and Benefits

Blast Hole Bits

Tungsten Carbide

Industrial Bits

Mineral

Exploration Bits

Steel Tooth Product Range

Pilot Bits

Additional Useful Data

1-2

3

4-5

6-10

11

12

13-16

17

18-21

TABLE OF CONTENTS

C E R T I F I E D

1

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

service and innovation.”

Company ValuesWe believe that people make a successful business.

We are a team of passionate people who :

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

Value our employees for their dedication and innovation.

Are accountable to our stakeholders.

Reliably provide products and service.

Ethically interact with our customers, competitors, vendors and community.

Lead in generating value for our customers.

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.

Development of Varel rock bits

since

After its founding in 1947,

Varel International remained a

family owned business until 1998,

and is now majority owned

by the Arcapita (USA) Group.

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.

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.

2000

2008

2

3

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.

Marathon TM & D-Force TM - feature comparison

Ridgeback TM Marathon Blast Hole

Ridgeback D-Force TM Blast Hole

HET carbide treatment

Vented cones

Tough & wear resistant cutting structure

New SP1 advanced bearing design

Ridgeback

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

Ridgeback D-ForceTM products contain new longer life bearings,

heavy duty shirttails, and improved abrasion resitant tungsten carbide

inserts for use in extremely abrasive applications.

Tougher carbide grades

HET carbide treatment

Vented cones

Increased hole wall

clearance

New abrasion resistant

carbide grades

New SP1 advanced bearing design

Sidewinder shirttail/gage

protection

4

INTRODUCING RIDGEBACK MARATHONTM AND RIDGEBACK D-FORCETM SERIES

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

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.

RIDGEBACK DESIGN TECHNOLOGY

High Energy Tumbling

CarbideShirttailProtection

Main RollerBearing

BallBearing

Pilot Bearing

AirPassageways

Air Vent Holes

High Energy Tumbling

Thrust Faces

ThrustButton

INNOVATION AND EVOLUTION

5

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

Maximum Gage Protection SRT (Semi Round 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.

Vented Cones Vented cones are standard in all Ridgeback MarathonTM 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.

• Longer bearing life

• Increased penetration

• Added gage penetration

• Reduced heat generation

• Larger cuttings

• Less dust

Innovation Advantages

Advanced Bearing DesignAll 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.

Improved Thrust CapacityBearing 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.

High Energy TumblingTM

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.

SERIES FEATURES AND BENEFITS

RIDGEBACK

MARATHON

RIDGEBACK

D-FORCE

Back Flow ValvesBFV’s are available for wet conditions on both Ridgeback MarathonTM and Ridgeback D-ForceTM models.

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)

6

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.

RB30/DF30 series

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

SOFT FORMATION INSERT BITS








RB40/DF40 series






APPLICATIONS:


DF43 series

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

Ridgeback D-Force(Sidewinder)

The Ridgeback MarathonTM series contains new longer life bearings,

additional gage protection, and improved cutting structure elements

for use in high pull-down applications.

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.






7

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

MEDIUM FORMATION INSERT BITS

STRENGTHS: 10,000 - 30,000 (psi)





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.




RB50 series

RB53/DF53 series

RB60/DF60 series





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.






8

APPLICATIONS:


RB63/DF63 series

All medium hard formation bits are designed with aggressive cutter profiles to provide extremely high penetration rates

when higher pulldown is needed.

MEDIUM HARD FORMATION INSERT BITS








RB67/DF67 series







9

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

in hard formations.

HARD/VERY HARD FORMATION INSERT BITS

STRENGTHS: 35,000 - 60,000 (psi)







COMPRESSIVE STRENGTHS: 50,000 (psi) and Higher





APPLICATIONS:



RB70/DF70 series

RB80G series






INSERT BIT PRODUCT LINE

6 1/4

6 3/4

7 3/8

7 7/8

9

9 7/8

10 5/8

11

12 1/4

13 3/4

16

3 1/2

3 1/2

3 1/2

4 1/2

4 1/2

6 5/8

6 5/8

6 5/8

6 5/8

6 5/8

7 BECO

159

171

187

200

229

251

270

280

311

349

406.4

RB30

RB30

RB30

RB30

RB40

RB40

RB40

RB40

RB40

RB40

RB40

RB50

RB50

RB50

RB43

RB50

RB53

RB53

RB53

RB53

RB53

RB53

RB53

RB53

RB60

RB60

RB60

RB60

RB60

RB60

RB60

RB60

RB60•

RB63

RB63

RB80G

RB80G

RB67

RB67

RB67

RB67

RB67

RB70

RB70

RB70

RB70

42

46

58

76

96

145

157

193

225

292

580

19

21

26

35

43

66

72

88

102

134

264

Diameter

Inches mm

Approx Wt

lbs kg

Pin Size

2 31 2 31 2 31

RIDGEBACK MARATHONTM SERIES

SOFT MEDIUM HARD

Inches

6 3/4

7 7/8

9

9 7/8

10 5/8

11

12 1/4

16

3 1/2

4 1/2

4 1/2

6 5/8

6 5/8

6 5/8

6 5/8

7 BECO

159

200

229

251

270

280

311

406.4

DF30

DF30

DF43

DF40

DF40

DF40

DF40

DF43

DF53

DF60

DF60

DF60

DF60

DF60

DF60

DF60

DF63

DF63

DF63

DF67

DF67

DF67

DF67

DF67

DF67*

DF70

42

76

96

145

157

193

225

580

19

35

43

66

72

88

102

264

Pin Size

RIDGEBACK D-FORCETM SERIES

SOFT MEDIUM HARD Diameter

Inches mm

Approx Wt

lbs kg2 31 2 31 2 31 Inches

*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

11

2 15/16 - 3

3 7/8

4

4 1/4

4 1/2

4 3/4

4 7/8

5 1/8

5 5/8

5 7/8

6

6 1/4

N Rod

2 3/8

2 3/8

2 3/8

2 3/8

2 7/8

2 7/8

2 7/8

3 1/2

3 1/2

3 1/2

3 1/2

75-76

98

101

108

114

121

123

130

143

149

152

159

M60

8

10

11

12

13

15

16

17

27

28

35

36

3.6

4.5

4.75

5.5

5.8

6.8

7.1

7.7

12.2

12.7

15.9

16.3

Diameter

Inches mm

Approx Wt

lbs kg

Pin Size

2 31 2 31 2 31

TUNGSTEN CARBIDE INDUSTRIAL BITSSOFT MEDIUM HARD

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

DW7DW9 DWHDW53ET

INDUSTRIAL BIT PRODUCT LINE

MINERAL EXPLORATION BITS

Varel has developed a range of reverse circulation bits with various bear-ing packages. These bits are suitable for soft/medium formation drilling and have: • Opennon-sealedrollerbearings.• Fullysealedcompensatedjournalbearings.

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.

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.

Open bea r ing p roduc t s f ea tu re p rec i s ion ro 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 rcu l a t ion p roduc t s a re des igned to p rov ide a combination of fast penetration and durability. These bits consistently provide the lowest cost per foot of drilled hole in mineral exploration applications.

5 1/2” - RC537

5 1/8"

5 1/4"

5 3/8"

5 1/2"

3 7/8"

4 3/4"

4 3/4"

4 3/4"

5"

5 1/8"

5 1/4"

5 3/8"

5 1/2"

5 5/8"

5 3/4"

5 7/8"

6"

6 1/8"

6 1/4"

6 1/2"

6 3/4"

DW53ET

RX53

RX53

RX53

CH24

CH24

CH35

ETD48

RC537

RC537

RC537

RC537

RC537

CH34

CH34

CH34

CH34

CH34

CH34

CH34

V537

MEDIUM

MEDIUM

MEDIUM

MEDIUM

SOFT

SOFT

MEDIUM

HARD

MEDIUM

MEDIUM

MEDIUM

MEDIUM

MEDIUM

MEDIUM

MEDIUM

MEDIUM

MEDIUM

MEDIUM

MEDIUM

MEDIUM

MEDIUM

OPEN

OPEN

OPEN

OPEN

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

SEALED*

Sizeof Bit Type Formation Bearing

BIT AVAILABILITY

12

* 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.

2 7/8

2 15/16

3 1/4

3 1/2-3 5/8

3 3/4

3 7/8-4 1/8

4 1/4

4 1/2

4 5/8

4 3/4

5

5 1/8

5 1/2

5 5/8

5 3/4

5 7/8

6

6 1/8

6 1/4

6 1/2

6 3/4

7 7/8

12 1/4

13 3/4

17 1/2

20

22

24

26

28

34

36

N Rod

N Rod

N Rod

2 3/8

2 3/8

2 3/8

2 3/8

2 3/8

2 7/8

2 7/8

2 7/8

2 7/8

2 7/8

3 1/2

3 1/2

3 1/2

3 1/2

3 1/2

3 1/2

3 1/2

3 1/2

4 1/2

6 5/8

6 5/8

6 5/8 or 7 5/8

6 5/8 or 7 5/8

7 5/8

7 5/8

7 5/8 or 8 5/8

7 5/8 or 8 5/8

7 5/8 or 8 5/8

7 5/8 or 8 5/8

73

75

79-82

89-92

95

98-105

108

114

117

121

123-127

130-133

140

143

146

149

152

156

159

165

171

200

311

349

445

508

559

610

660

711

863

914

L121*

L121*

L111*

L111*

L111*

L111*

L111*

L113*

L3A

L3A

V3S0

L2

L2

L2

L2

L2

L2

L2

L2

L2

L2

L2

L2

L2

L2

L2

L2

L2

L2

L2

LH1

LH1

LH1

LH1

LH1

LH1

CH12MS

V517

ETD14

V435

CB24

V537

ETD24

CB24

ETD24

V515

ETD38

L1

L1

L1

V3M0

4

4

4 1/4

9

9

9

10

11

11

16

16

17

17

22

22

22

26

26

29

29

33

62

200

292

450

860

891

1125

1300

1420

2200

2400

1.8

1.8

1.9

4.1

4.1

4.1

4.5

5

5

7.3

7.3

7.7

7.7

10

10

10

11.8

11.8

13.2

13.2

15

28

91

133

204

391

404

510

589

645

1000

1100

Diameter

Inches mm

Approx Wt

lbs kg

Pin Size Sealed Bearing TCI

2 31 2 31 2 31

STEEL TOOTH BIT PRODUCT LINE

Soft Med M/Hrd

SOFT MEDIUM HARD

* 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

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

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

V3MO

L111

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.

V3M0

L121

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.

14

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

SOFT FORMATION STEEL TOOTH BITS

L121

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

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

LH1

L2

COMPRESSIVE STRENGTHS: 8,000 - 18,000 (psi) DRILLING SPEEDS: 35 to 75 rpm REGULAR CIRCULATION: All sizes DRILLING WEIGHTS: 3,500 to 6,500 (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

L1

15

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.

MEDIUM & HARD FORMATION STEEL TOOTH BITS

LH1

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.

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

RegularCenterFluidCirculationVarel 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.

Regular Air CirculationVarel 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.

JetCirculationFluidorAirVarel 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.

ForgedTeeth,uniquetoVarelVarel 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.

OptionalFeatures

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.

16

FEATURES

17

SEALED BEARING PILOT HOLE BITS

Premium Sealed Bearing Pilot Hole Bits

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.

15"

13 3/4"

12 1/4"

11"

9"

PHR80*

PH80

PHR80* - PH80

PH60 - PH80

PH80

Bit Sizes Bit Type

CURRENTPILOT BIT

AVAILABILITY

12 1/4” - 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.)

feet

metres

inches

millimeters

pounds

decanewtons

tonne

pounds

kilograms

32nds

millimeters

barrels

cubic meters

U.S. gallons

cubic meters

U.S. gallons

liters

barrels/min

gallons/min

gallons/min

liters/min

feet/min

meters/min

psi

kilopascals

psi

megapascals

psi

atm

psi

bars

psi

kilogram/sq cm

pound/gallon

kilogram/cubic meter

pound/gallon

specific gravity

pound/gallon

psi/100 ft

foot pound

newton meters

square inches

square millimeters

DEPTH

WEIGHT ON BIT

NOZZLE SIZE

VOLUME

CIRCULATION RATE

ANNULAR VELOCITY

PRESSURE

MUD WEIGHT (density)

TORQUE

AREA

meters

feet

millimeters

inches

decanewtons

tonne (metric)

pounds

kilograms

pounds

millimeters

32nds

cubic meters

barrels

cubic meters

U.S. gallons

liters

U.S. gallons

gallons/min

barrels/min

liters/min

gallons/min

meters/min

feet/min

kilopascals

psi

megapscals

psi

atm

psi

bars

psi

kilogram/sq cm

psi

kilogram/cubic meter

pound/gallon

specific gravity

pound gallon

psi/1000 ft

pound gallon

newton meters

foot pound

square millimeters

square inches

0.3048

3.2808

25.4

0.0394

0.4448

2.2481

0.0004536

0.4536

2.205

0.7938

1.2598

0.1590

6.290

0.003785

264.2

3.7854

0.2642

42

0.02381

3.7854

0.2642

0.3048

3.2808

6.8947

0.14504

0.006895

145.038

0.06804

14.696

0.06895

14.5038

0.07031

14.2233

119.829

0.008345

0.119829

8.3452

51.948

0.01923

1.3558

0.7376

645.16

0.00155

CONVERSION TABLE

TO CONVERT INTO MULTIPLY BY

18

40

43

50

53

60

63

67

70

80

30SOFT

MEDIUM

HARD

2500PSI 75005000 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

17.2MPA 51.734.5 69.0 86.2 103.4 120.7 137.9 155.1 172.4 189.6 206.8 224.1 241.3 258.6 275.8 293.0 310.3 327.5 344.7 362.0 379.2 396.5 413.7 430.9 448.2 465.4 482.6

2.5PTO 64 7 8 10 11 12 13 14 15 16 17 18 18 19 20 21 22 23 23 24

Varel Ridgeback MarathonTM

Ridgeback D-ForceTM Series Insert Bits

SAN

DST

ON

E (S

OFT

)

SCH

IST

(SO

FT)

FORM

ATIO

N

LIM

ESTO

NE

(HA

RD)

LIM

ESTO

NE

(SO

FT)

SAN

DST

ON

E (H

ARD

)

CON

GLO

MER

ATE

BASA

LT (H

ARD

)

DIO

RITE

SLAT

E

QU

ART

ZITE

(S

OFT

)

GN

EISS

(A

VER

AG

E)

GA

BBRO

GRA

NIT

E

DIA

BASE

(D

OLE

RITE

)

QU

ART

ZITE

(H

ARD

)

AM

PHIB

OLI

TE

VAREL INSERT BIT COMPARISON AND HARDNESS TABLE

REPRESENTATIVE ROCK COMPRESSIVE STRENGTH in psi / mpa / protodjakonov scales

V3MO

L2

L1

LH1

L111

Varel Steel Tooth

Bits

VAREL STEEL TOOTH BIT COMPARISON AND HARDNESS TABLE

REPRESENTATIVE ROCK COMPRESSIVE STRENGTH in psi / mpa / protodjakonov scales

1000PSI 30002000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 16000 17000 18000 19000

6.9MPA 20.713.8 27.6 34.5 41.4 48.3 55.2 62.1 69.0 75.8 82.7 89.6 96.5 103.4 110.3 117.2 124.1 131.0

1PTO 32 4 6 6 7 8 9 9 10 10 11 11 12

CON

GLO

MER

ATE

SCH

IST

(SO

FT)

TUFF

SAN

DST

ON

E (S

OFT

)

LIM

ESTO

NE

(SO

FT)

LIM

ESTO

NE

(HA

RD)

SAN

DST

ON

E (H

ARD

)

BASA

LT (S

OFT

)

SHA

LE (S

OFT

)

DO

LOM

ITE

AN

DES

ITE

MA

RBLE

SCH

IST

(HA

RD)

DIO

RITE

FORM

ATIO

N

SOFT

MEDIUM

HARD

CHARTS FOR MAXIMUM BIT LIFE

19

20

USEFUL OPERATIONAL DATA

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.

Total Drilling Cost

TDC = B + R FP

TDC = Total drilling cost per foot or meter drilled

B = Total bit price

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

Tips for optimizing drill bit performance

1/2"

9/16"

5/8"

11/16"

3/4"

13/16"

7/8"

15/16"

1"

7/16"

1/2"

9/16"

5/8"

3/4"

13/16"

7/8"

15/16"

1"

7/16"

1/2"

9/16"

5/8"

11/16"

3/4"

13/16"

7/8"

15/16"

Non-ventednozzle size

(one)

Nozzle size for vented cones (one)

Bit size 9"

Bit size9 7/8" - 13 3/4"

Nozzle Size Adjustment For Vented Cones

1. 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.

1/4

9/32

5/16

11/32

3/8

13/32

7/16

15/32

1/2

17/32

9/16

5/8

11/16

3/4

7/8

1

1 1/8

1 1/4

6.35

7.14

7.93

8.73

9.52

10.31

11.11

11.90

12.70

13.49

14.28

15.87

17.46

19.05

22.22

25.40

28.57

31.75

.049

.062

.076

.093

.110

.130

.150

.172

.196

.222

.248

.306

.372

.442

.601

.785

.993

1.228

31.62

40.00

49.04

60.00

70.97

83.88

96.78

110.97

126.46

143.23

160.01

197.43

240.01

285.18

387.77

506.48

640.68

792.31

.147

.186

.228

.279

.330

.390

.450

.516

.588

.666

.745

.918

1.116

1.326

1.803

2.355

2.985

3.684

94.84

120.01

147.11

180.01

219.92

251.63

290.34

332.92

379.38

429.70

480.67

592.29

720.04

855.54

1163.30

1519.45

1925.92

2376.92

in.

Hole Size Area/1 Hole Area/3 Holes

mm Sq. in. mm2 mm2Sq. in.

Nozzle Hole Area Chart

USEFUL OPERATIONAL DATA

in. mm in. mm in. mm 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2600 2800 3000

1/25/83/47/81

3/47/81

1 1/85/83/47/81

1 1/8

3/47/81

1 1/81 3/81 1/2

2

5 3/8to

6 3/4

7 3/8to

7 7/8

9to

9 7/8

10 5/8to

17 1/2

137

171

187

200

229

251

270

445

12.7015.8719.0522.2225.4019.0522.2225.4028.5715.8719.0522.2225.4028.57

19.0522.2225.4028.5734.9238.1050.80

7.939.5211.1112.7014.2811.1112.7014.2815.879.5211.1112.7014.2815.8719.0511.1112.7014.2815.8719.0522.2228.57

453630262124

2922

55463732263124

393024

6554443632383023

49383023

22

5/163/8

7/161/2

9/167/161/2

9/165/83/8

7/161/2

9/165/83/4

7/161/2

9/165/83/47/8

1 1/8

7564514437453629245745362922

2821

8472605144524235296553423528

332622

816857505848403473614841352238302622

7664546654463980685646392544363025

82705972625244

756352442949413428

766578705850

82695749345546373022

827084796455

74625239615041342520

76

877060

80675643665545372822

82

7665

716146725949413124

8371

766550786353453426

76

816953

6858493728

82

7357

7362524030

7760

7866564331

8164

70604533

67

7564483620

71

67513822

74

71544028

78

75574330

82

604530

644732

685034

FullAir

CourseDiameter

Bit SizeRange

JetNozzle

Diameter3 Each

Air Pressure Drop (pounds per square inch) Bits with various air course diameters or jet nozzle sizes

Air Volume DeliveredCubic Feet Per Minute

BIT AIR PRESSURE DROP CHART

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.

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

Bailing velocity

BV = 183.3xACFM D2 _ d2

BV = Bailing velocity(feet per minute)ACFM = Actual cubic feet of free air per minute delivered183.3 = Factor for conversionD = Diameter of the hole being drilled. (inches)d = Outside diameter of the drill pipe being utilized. (inches)

21

MEXICOVAREL DE MEXICO, S.A DE C.V.3a. Y Michoacan #310 SurFraccionamiento Moderno, H. MatamorosTamaulipas, MexicoC.P. 87380Phone: +52-868-8170467Fax: +52-868-8172106Email: [email protected]

S A L E S O F F I C E S W O R L D W I D E :

7146

- 0

8200

8

Visit us at WWW.VARELINTL.COM

VARELINTERNATIONALCORPORATEHEADQUARTERS1434 Patton, Suite 106, Carrollton, Texas 75007Mailing address:P.O. Box 540157, Dallas, Texas 75354-0157Phone: +1-972-242-1160Fax: +1-972-242-8770Email: [email protected]: 1-800-VARELCO (827-3526)

SOUTHAMERICA VAREL INTERNATIONAL Ind. L.P. Sucursal del Peru Las Poncianas 105/107, La Molina Vieja Lima 12, Peru Phones: +51-1-365-2529 / 365-5178Fax: +51-1-365-8305 Cellular: +51-1-9999-60283/+51-1-994565587 RPM # 297165Email: [email protected] Email: [email protected]

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