Drill Collars

DRILL Collars

G r a n t

P r i d e c o

DRI L L IN G

P ROD U CT S

AND

S ER V ICE S

DRI L L

CO L L AR S

MATERIALS Materials Mechanical Properties

Drill Collar Diameter

Minimum Minimum Yield Strength Tensile Strength

Minimum Hardness

in.

psi

3 1/8 thru 6 7/8

110,000

140,000

285



100,000

135,000

285

7 thru 11

psi

D

rill collars are manufactured from AISI

BHN

Tensile properties are determined by tests on cylindrical specimens conforming to the requirements of the current ASTM A370, 0.2% offset method. Hardness tests are performed on the OD of all drill collars in compliance with current ASTM standards.

4142H-4145H modified steel, and are supplied in the “as rolled” surface fin-

ish condition. Alternative surface finishes can be provided. Drill collars are trepanned and drifted to API Spec. 7 Latest Edition. Full-length heattreatment processes ensure that mechanical properties meet or exceed API Spec. 7 Latest Edition requirements.

A hardness range of 285-341, Brinell

Hardness and Charpy “V” notch minimum impact strength of 40 ft-lb at 700F are guaranteed one inch below the surface.

Traceability Drill collar material and process traceability are maintained from receipt of mill certified raw material to completion of all the manufacturing. Serial numbers are die stamped on bar bodies.

Rigid Inspection Procedures We inspect all our drill collars to comply with API standards and our own internal specifications. These inspections include visual dimensional checks as well as ultrasonic inspections over the entire body of the drill collar.

© Grant Prideco. All rights reserved. December 2003

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product specifications Cold Rolling

API Connections

G

rant Prideco drill collars are manufactured in 30-ft and 31-ft lengths. All API connections comply with dimensional requirements speci-

fied in API Spec. 7 Latest Edition and guidelines pre-

Drill collar thread roots, as well as elevator recess upper radii, are cold-rolled. Cold rolling creates a compressive recess upper radii stress condition that increases fatigue life by minimizing crack initiation.

sented in API RP7G Latest Edition. Common sizes and styles are summarized on the next page. In addition, other connections such as OH, FH, PAC, WO, SLH90, SH, and H90, are available to meet specific needs.

Phosphate Coating

The cold-rolling process consists of compressing metal fibers by means of a roller.

All connections are phosphate-coated to improve resistance to galling.

Stress Relief Features (SRF) Pin stress relief groove and API boreback box API pin stress relief groove and API boreback box decrease the frequency of fatigue failures. These features increase connection flexibility and reduce high-stress concentrations that normally occur adjacent to the end of engaged threads. Stress relief features are machined in compliance with API Spec. 7 Latest Edition. As indicated in API Spec. 7 Latest Edition, connections NC23, NC26 (2 3/8 IF) and NC31 (2 7/8 IF) do not have sufficient metal to accommodate stress relief features.

SRTTM Stress Relief Thread Form Grant Prideco’s patented SRT modified thread form can be applied to BHA connections to reduce stress in the thread roots and significantly improve connection fatigue life. Enlarged Thread API Thread Form Root Radius The stress reduction is accomplished by The enlarged root radius of the modimachining an enlarged radius into the root fied thread form reduces the stress of the stab-flank thread. The SRT thread form concentration at the thread root. provides a larger reduction in stress level and longer connection fatigue life than either the API box stress relief groove or the boreback box feature. TM

API pin stress relief groove and API boreback box remove unengaged threads in highly stressed areas of the drill collar connection.

TM

98

© Grant Prideco. All rights reserved. December 2003

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SRTTM Stress Relief Thread Form (Cont.)

CO L L AR S

Summary of Connection FEA Results

In addition to providing increased connection fatigue life, SRT boxes reduce the overall length required for recut by more than one inch when compared to boxes with API stress relief features. TM

(psi) Model Description

Stress Intensity at Last Engaged Box Thread Root 10 deg/100 ft

20 deg/100ft

171,734

240,087

API Stress Relief Groove Box 160,528

220,717

API Boreback Box

165,394

226,047

Modified Thread Form

142,441

196,487

Standard Box

API SPECIFICATIONS • API Specification 7 Latest Edition • API Recommended Practice 7G Latest Edition • API Specification Q1 Latest Edition

Drill collars are manufactured in compliance with the following API standards:

Drill Collar Data Drill Collar Drill Collar Bore Approximate Section Displacement Typical Bending + 1 / 16” Number Diameter Length Weight Modulus (open ended) Strength -0” (1) Ratio in. in. ft lb/ft. ( in.3 ) US gal/ft 1 1 NC 23-31 3 / 8 1 / 4 30 22.00 2.919 0.337 2.57:1

NC 26-35 (2 3 / 8 IF) 7

NC 31-41 (2 / 8 IF)

3 1 / 2

1 1 / 2

1

4 / 8

2

3

30

26.70

4.067

0.408

2.42:1

30 or 31

33.65

6.510

0.515

2.43:1

NC 35-47

4 / 4

2

30 or 31

46.81

10.191

0.716

2.58:1

NC 38-50 (3 1 / 2 IF)

5

2 1 / 4

30 or 31

53.29

11.769

0.815

2.38:1

NC 44-60

6

2 1 / 4

30 or 31

82.61

20.786

1.264

2.49:1

NC 44-60

6

13

2 /16

30 or 31

75.90

20.182

1.161

2.84:1

NC 44-62

6 1 / 4

2 1 / 4

30 or 31

90.52

23.566

1.385

2.91:1

NC 46-62 (4 IF)

6 1 / 4

2 13 /16

30 or 31

83.81

22.986

1.282

2.63:1

1

1

NC 46-65 (4 IF)

6 / 2

2 / 4

30 or 31

99.52

26.574

1.522

2.76:1

NC 46-65 (4 IF)

6 1 / 2

2 13 /16

30 or 31

92.81

26.016

1.420

3.05:1

NC 46-67 (4 IF)

6 3 / 4

2 1 / 4

30 or 31

108.52

29.821

1.600

3.18:1

1

1

NC 50-70 (4 / 2 IF)

7

2 / 4

30 or 31

117.52

33.315

1.798

2.54:1

NC 50-70 (4 1 / 2 IF)

7

2 13 /16

30 or 31

110.77

32.796

1.694

2.73:1

1

NC 50-72 (4 / 2 IF)

1

7 / 4

2 /16

30 or 31

119.81

36.565

1.833

3.12:1

NC 56-77

7 3 / 4

2 13 /16

30 or 31

139.90

44.906

2.140

2.70:1

NC 56-80

8

2 13 /16

30 or 31

150.81

49.498

2.307

3.02:1 2.93:1

5

1

13

13

6 / 8 API Reg

8 / 4

2 /16

30 or 31

161.81

54.382

2.472

NC 61-90

9

2 13 /16

30 or 31

195.81

70.887

2.995

3.17:1

7 5 / 8 API Reg

9 1 / 2

3

30 or 31

217.00

83.336

3.319

2.81:1

NC 70-97

9 3 / 4

3

30 or 31

230.00

90.179

3.518

2.57:1

NC 70-100

10

3

30 or 31

242.97

97.380

3.717

2.81:1

8 5 / 8 API Reg

11

3

30 or 31

299.00

129.948

4.574

2.84:1

Note: (1) The number connection (NC) is an API connection with the V- .065 thread form with a V- .038R thread root radius. The first two digits are the pitch diameter of the thread and the last two digits are the outside diameter of the drill collar.

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SLIP AND ELEVATOR RECESSES

20” A

A

R Cold Work Shoulder Area 16” B

B

2” Radius

3” 3”

1” Radius Shoulder Area C 2” Radius

18” C 3”

G

rant Prideco offers optional slip and elevator recesses to improve handling efficiency and safety. The upper radius of the elevator recess is cold-

rolled to increase product life. Slip and elevator recesses can be used together or separately. Unless otherwise specified, slip and elevator recesses are machined in compliance with API RP7G Latest Edition guidelines.

100

© Grant Prideco. All rights reserved. December 2003

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Slip and Elevator Recesses Drill Collar Elevator Slip Elevator Diameter Recess Recess Recess Diameter Diameter Radius A B C R in. in. in. in. 1



4 / 8



3





3

1

/8

4 / 4

4 / 8

/8

5

1

4 / 2

5

4 / 8

1

/8

6

3

5 / 8

1

5 / 2

1

/8

5

3

5 / 4

1

/8

6

1

/8

1

6 / 4

3

/16

4 /4

1

5 / 8

1

7

6 /4 6 /2 3

6 / 4 7 1





3 / 4

1

3



/16

3

7 / 4



11 1





3

7 /4 8 1

8 /4 9

5 / 8 6 1

6 / 4

1

6 / 2

3

/16

1

3

6 / 4

3

/16

1

7 / 4

3

/16

6 / 2 7 1

7 / 4

1

7 / 2

3

/16

1

7 / 2

3

7 / 4

3

/16

1

1

8 / 2

1

/4

9

1

/4

8 / 8 1

8 / 8

3

7

8 / 8

1

9 / 4

1

/4

1

1

1

/4

1

/4

9 /2 9 /4 10 11

5

9 / 8 1

10 / 8

9 / 2 1

10 / 2

While every effort has been made to insure the accuracy of the tables herein, this material is presented as a reference guide only. The technical information contained herein should not be construed as a recommendation. Grant Prideco cannot assume responsibility for the results obtained through the use of this material. No expressed or implied warranty is intended.

© Grant Prideco. All rights reserved. December 2003

101

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HARDFACING Grant Prideco Offers Numerous Hardfacing Options:

• SmoothX

Grant Prideco’s patented hardfacing that provides a smooth sur-

®

• SuperSmoothX

face with little or no exposed carbide.

Grant Prideco’s patented solution for applications requiring a

®

“machine-finished” surface.

Fine Particle Tungsten-Carbide, applied either flush or raised,

• Grant Prideco 1000 Series Hardfacing TM

provides economical protection in open hole applications.

Grant Prideco offers custom engineering hardfacing for specific

• Other

applications.

4”

1” 10”

1”

1”

30” Min. 1”

10” 1”

Pin End 102

Box End with Slip Recess Only

10”

Box End with Slip and Elevator Recess

DRI L L

CO L L AR S

DOUBLE SHOULDERED CONNECTIONS High Torque Applications

G

rant Prideco Double Shouldered connections (HT, XT, GPDS) are patented, high-performance con-

nections that offers significantly more torsional strength than standard API connections of similar size.

Spiral Drill Collars

S

piral drill collars are part of Grant Prideco’s complete product line. Spiral grooves let mud cir-

culate freely around the drill collar to equalize pressure and prevent a seal from forming. This reduces the occurrence of differential pressure sticking.

Spiral prevents differential sticking

Without Spiral

© Grant Prideco. All rights reserved. December 2003

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Drill Collars – Recommended Make-Up Torque and Bending Strength Ratios ft-lb (See Note 2) Size and Type Drill Collar Bore (in.) of Connection OD in.

1 ft-lb BSR

1 1 / 4 ft-lb BSR

1 1 / 2 ft-lb BSR 2,500 2.49



3

2,500 2.03

2,500 2.17

API NC 23

3 1/8

3,300 2.40

3,300 2.57

2,600 2.94

4,000 2.81

3,400 3.00

2,600 3.43



3 1/4

1 3 / 4 ft-lb BSR



3

2,200 2.36

2,200 2.70

1,700 3.53

2 3 / 8 Regular

3 1 / 8

3,000 2.75

2,600 3.14

1,700 4.10



3 1 / 4

3,300 3.17

2,600 3.62

1,700 4.72



3

3,800 1.78

3,800 2.01

2,900 2.53

2 7 / 8 PAC

3 1 / 8

5,000 2.15

4,200 2.43

2,900 3.07

(See Note 6)

3 1 / 4

5,200 2.55

4,200 2.88

2,900 3.63

3 1 / 2

4,600 2.25

4,600 2.42

3,700 2.76

3 3 / 4

5,500 2.96

4,700 3.18

3,700 3.64



3 1 / 2

3,800 2.27

3,800 2.42

3,800 2.73

2 7 / 8 Regular

3 3 / 4

5,800 2.91

5,000 3.10

4,000 3.49



3 7 / 8

5,800 3.26

5,000 3.48

4,000 3.91

3 3 / 4

4,100 1.53

4,100 1.58

4,100 1.68 5,400 1.93

ft-lb

2 BSR

2 1 / 4 ft-lb BSR

2 1 / 2 ft-lb BSR

2 13 / 16 ft-lb BSR

2 3/8 IF API NC 26 2

2

7/

7/

8

8

Slim Hole

XH

3 1 / 2 Dbl Streamline

3 7 / 8

5,400 1.76

5,400 1.82

2 7 / 8 Mod. Open

4 1 / 8

8,100 2.26

8,100 2.34

7,400 2.48



3 7 / 8



4,600 1.54

4,600 1.59

4,600 1.69

4,600 1.85

4,600 2.16

2 7 / 8 IF

4 1 / 8

7,400 2.03

7,400 2.10

7,400 2.22

6,900 2.44

5,400 2.84

NC 31

4 1 / 4

8,900 2.29

8,900 2.37

8,200 2.51

6,900 2.75

5,400 3.21

3 1 / 2 Slim Hole

4 1 / 2

10,300 2.86

9,300 2.95

8,200 3.13

6,900 3.43

5,400 4.01 5,700 2.85





4 1 / 8

6,500 2.09

6,500 2.16

6,500 2.27

6,500 2.48

3 1 / 2 Regular

4 1 / 4

7,900 2.34

7,900 2.41

7,900 2.54

7,100 2.77

5,700 3.18



4 1 / 2

10,500 2.86

9,500 2.95

8,400 3.11

7,100 3.39

5,700 3.90



4 1 / 2

9,000 1.95

9,000 2.07

9,000 2.26

NC 35

4 3 / 4

12,300 2.44

10,800 2.58

9,200 2.82

7,400 3.24



5

12,300 2.97

10,800 3.14

9,200 3.43

7,400 3.95



4 1 / 4

5,200 1.31

5,200 1.37

5,200 1.48

5,200 1.68

3 1 / 2 XH

4 1 / 2

8,500 1.71

8,500 1.80

8,500 1.95

8,300 2.20

4 Slim Hole

4 3 / 4

12,100 2.16

11,800 2.27

10,100 2.46

8,300 2.77

3 1 / 2 Mod. Open

5

13,300 2.65

11,800 2.79

10,100 3.01

8,300 3.40



5 1 / 4

13,300 3.18

11,800 3.35

10,100 3.62

8,300 4.08



4 3 / 4



10,000 1.73

10,000 1.80

10,000 1.92

10,000 2.10

8,300 2.54

3 1 / 2 IF

5



13,900 2.15

14,000 2.24

12,900 2.38

11,000 2.61

8,300 3.15

NC 38

5 1 / 4

16,200 2.61

14,500 2.71

12,900 2.88

11,000 3.17

8,300 2.82

1/

5 1 / 2

16,200 3.10

14,500 3.23

12,900 3.43

11,000 3.77

8,300 4.54

4

104

2

Slim Hole

7,400 2.59

Notes: (API, RP7G Latest Edition) 1. Basis of calculations for recommended make-up torque assumed the use of a thread compound containing 40% to 60% by weight of finely powdered metallic zinc, or 60% by weight of finely powdered metallic lead, with no more than 0.3% total active sulfur (reference the caution regarding the use of hazardous materials in API Spec. 7 Latest Edition), applied thoroughly to all threads and shoulders. Also, the modified screw jack formula was used, as shown in the IADC Drilling Manual and the API Spec. RP7G Latest Edition and a unit stress of 62,500 psi in the box or pin, whichever is weaker. Torque values are rounded to the nearest 100 ft-lb. 2. Normal torque range is calculated value plus 10%. Higher torque values may be used under extreme conditions. 3. In each connection size and type group torque values apply to all connection types in the group, when used with the same drill collar OD and bore, i.e. 2 3/8 API IF, API NC26 and 2 7/8 Slim Hole connections, used with 3 1/2 x 1 1/4 drill collars, all have the same minimum make-up torque of 4600 ft-lbs and the box is the weaker member. 4. Stress-relief features are disregarded for make up torque calculation. 5. H-90 connection make-up torque is based on 56,200 psi stress and other factors, as listed in note 1. 6. 2 7/8 PAC make-up torque is based on 87,500 psi stress and other factors, as listed in note 1. 7. Torque figures in bold indicate that the weaker member for the corresponding outside diameter and bore is the box. For all other torque values, the weaker member is the pin.

DRI L L

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Drill Collars – Recommended Make-Up Torque and Bending Strength Ratios ft-lb (See Note 2)

Size and Type Drill Collar Bore (in.)

of Connection OD in.

1 3 / 4 ft-lb BSR

2 ft-lb

BSR

4 3/4 8,800 1.46 8,800 1.51 5 12,800 1.83 12,800 1.89 3 2 H-90 (See Note 5) 5 1/4 17,100 2.23 16,900 2.31 18,500 2.67 16,900 2.76 5 1 / 2 5 10,900 1.61 10,900 1.66 4 Full Hole 5 1 / 4 15,300 1.98 15,300 2.04 NC 40 5 1/2 20,000 2.38 18,900 2.46 20,500 2.62 18,900 2.91 4 Mod. Open 5 3 / 4 4 1 / 2 Dbl. Streamline 6 20,500 3.29 18,900 3.39 5 1 / 4 12,600 1.47 12,600 1.51 5 1 / 2 17,400 1.80 17,400 1.85 4 H-90 5 3 / 4 22,500 2.17 22,500 2.22 (See Note 3) 6 25,400 2.55 23,700 2.61 6 1 / 4 25,400 2.97 23,700 3.04 15,600 1.94 5 1/2 15,600 1.89 4 1 / 2 API Regular 5 3 / 4 20,600 2.24 20,600 2.29 6 25,400 2.62 23,700 2.65 6 1 / 4 25,400 3.02 23,700 3.09 5 3 / 4 20,900 1.99 20,900 2.04 NC 44 6 26,500 2.36 25,500 2.41 6 1 / 4 27,300 2.76 25,500 2.82 27,300 3.19 25,500 3.25 6 1 / 2 5 1 / 2 13,000 1.60 5 3 / 4 18,100 1.92 6 23,600 2.28 4 1 / 2 FH 27,300 2.64 6 1 / 4 6 1 / 2 27,300 3.03 4 1 / 2 XH 5 3 / 4 6 NC 46 4 IF 6 1 / 4 5 Dbl. Streamline 6 1 / 2 4 1 / 2 Mod. Open 6 3 / 4 5 3 / 4 6 4 1 / 2 H-90 6 1 / 4 (See Note 5) 6 1 / 2 6 3 / 4



1/

5 H-90 (See Note 5)

6 1 / 4 6 1 / 2 6 3 / 4

2 1 / 4 ft-lb BSR 8,800 12,800 15,100 15,100 10,900 15,300 17,000 17,000 17,000 12,600 17,400 21,700 21,700 21,700 15,600 20,600 21,700 21,700 20,900 23,500 23,500 23,500 13,000 18,100 23,600 25,300 25,300 17,700 23,400 28,000 28,000 28,000 18,000 23,700 28,700 28,700 28,700

2 1 / 2 ft-lb BSR

2 13 / 16 ft-lb BSR

ft-lb

3 BSR

1.59 1.99 2.43 2.91 1.74 2.14 2.57 3.04 3.55 1.56 1.91 2.29 2.70 3.15 2.00 2.37 2.77 3.20 2.10 2.49 2.91 3.36 1.85 1.97 2.33 2.71 3.12 1.68 2.02 2.38 2.77 3.18 1.83 1.95 2.30 2.88 3.08

8,800 12,800 13,200 13,200 10,900 15,000 15,000 15,000 15,000 12,600 17,400 19,500 19,500 19,500 15,600 19,600 19,600 19,600 20,900 21,300 21,300 21,300 13,000 18,100 23,000 23,000 23,000 17,700 23,400 25,700 25,700 25,700 18,000 23,700 26,400 26,400 26,400

1.71 2.15 2.43 3.14 1.86 2.29 2.75 3.25 3.79 1.64 2.01 2.41 2.84 3.31 2.10 2.49 2.91 3.35 2.20 2.61 3.04 3.51 1.71 2.06 2.42 2.82 3.25 1.74 2.09 2.47 2.87 3.30 1.69 2.02 2.38 2.77 3.19

8,800 10,400 10,400 10,400 10,900 12,100 12,100 12,100 12,100 12,600 16,500 16,500 16,500 16,500 15,600 16,600 16,600 16,600 18,200 18,200 18,200 18,200 13,000 18,100 19,900 19,900 19,900 17,700 22,400 22,400 22,400 22,400 18,000 23,200 23,200 23,200 23,200

1.99 2.49 3.04 3.64 2.11 2.60 3.12 3.70 4.31 1.80 2.20 2.84 3.12 3.63 2.30 2.72 3.18 3.67 2.39 2.84 3.31 3.82 1.85 2.22 2.81 3.04 3.50 1.87 2.24 2.64 3.07 3.57 1.80 2.16 2.54 2.96 3.40

13,000 17,900 17,900 17,900 17,900 17,700 20,300 20,300 20,300 20,300 18,000 21,100 21,100 21,100 21,100

25,400 1.80 31,900 2.12 35,300 2.45

25,400 31,900 32,900

1.85 2.17 2.52

25,400 29,400 29,400

1.95 2.29 2.65

25,400 2.03 27,200 2.38 27,200 2.76

3 1/4 ft-lb BSR

1.93 2.36 2.76 3.24 3.73 1.97 2.37 2.79 3.25 3.74 1.90 2.28 2.69 3.12 3.59 24,000 24,000 24,000

2.18 2.56 2.97

4. In each connection size and type, group torque values apply to all connection types in the group when used with same drill collar OD and bore; i.e., 2 3/8 IF, API NC26 and 2 7/8 Slim Hole connections,used with 3 1/2 x 1 1/4 drill collars, all have the same minimum make-up torque of 4600 ftlb and the box is the weaker member. 5. Stress-relief features are disregarded for make-up torque calculation. 6. H-90 connection make-up torque is based on 56,200 psi stress and other factors, as listed in note 1. 7. 2 7/8 PAC make-up torque is based on 87,500 psi stress and other factors, as listed in note 1. 8. Conventional recommended BSR tanges do not apply to Double-Shouldered connection (HT, XT, GPDS) designs. Current industry target BSR ranges should not be used as an indicator of Double-Shouldered acceptance/rejection. 9. Torque figures in bold indicate that the weaker member for the corresponding OD and bore is the box. For all other torque values, the weaker member is the pin.

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Drill Collars – Recommended Make-Up Torque and Bending Strength Ratios ft-lb (See Note 2) Size and Type Drill Collar Bore (in.) of Connection OD in. 4 1 / 2 IF

6 1 / 2

2 1 / 2 ft-lb BSR

2 13 / 16 ft-lb BSR

ft-lb

23,000 1.59

23,000 1.63

23,000 1.71

23,000 1.77

23,000

29,700 1.89

29,700 1.93

29,700 2.03

29,700 2.10

26,700

2.24

30,000 2.46

26,700

2.62

3 BSR

3 1 / 4 ft-lb BSR

ft-lb

3 1 / 2 BSR lb/ft

3 3 /4 BSR 1.89

API NC 50

6 3 / 4

36,700 2.21

35,800 2.26

32,300 2.37

5 XH

7

38,400 2.54

35,800 2.61

32,300 2.73

30,000 2.83

26,700

3.02

5 Mod. Open

7 1 / 4

38,400 2.91

35,800 2.98

32,300 3.12

30,000 3.24

26,700

3.45

38,400 3.29

35,800 3.38

32,300 3.53

30,000 3.17

26,700

3.91

6 3 / 4

34,500 1.94

34,500 1.98

34,500 2.06

34,100

2.13

30,800

2.25

7

42,000 2.25

40,100 2.30

36,500 2.39

34,100

2.46

30,800

2.60

7 1 / 4

42,700 2.57

40,100 2.63

36,500 2.73

34,100

2.82

30,800

2.98

7 1 / 2

42,700 2.92

40,100 2.98

36,500 3.10

34,100

3.20

30,800

3.38

6 3 / 4

31,900 2.07

31,900 2.11

31,900 2.20

31,900 2.72

30,500

2.40

7

39,400 2.37

39,400 2.42

36,200 2.52

33,900 2.60

30,500

2.75

7 1 / 4

42,500 2.70

39,900 2.76

36,200 2.87

33,900 2.96

30,500

5 1 / 2 Dbl. Streamline 5 1 / 2 H-90 (See Note 5) 5 1 / 2 API Regular

7 1 / 2

3.13



7 1 / 2

42,500 3.04

39,900 3.11

36,200 3.23

33,900 3.34

30,500



7

32,800 1.64

32,800 1.67

32,800 1.72

32,800 1.76

32,800

5 1 / 2 API FH

7 1 / 4

41,000 1.91

41,000 1.95

41,000 2.00

41,000 2.05

41,000

2.14

49,700 2.20

49,700 2.24

47,800 2.30

45,200 2.36

41,500

2.45



7 1 / 2

7 3 / 4



54,500 2.50

7 1 / 4

NC 56

7 1 / 2

3.53 1.83

51,700 2.54

47,800 2.62

45,200 2.68

41,500

2.79

40,500 2.05

40,500 2.11

40,500 2.16

40,500

2.24 2.55

50,000 2.33

48,200 2.39

45,600 2.45

42,100



7 3 / 4

52,100 2.62

48,200 2.70

45,600 2.76

42,100

2.87



8

52,100 2.94

48,200 3.02

45,600 3.09

42,100

3.21

7 1 / 2

46,400 1.96

46,400 2.01

46,400 2.05

46,400

2.12

55,600 2.24

53,300 2.30

50,700 2.35

46,900

2.43 2.75

6

5/

8

API Regular

7 3 / 4



8

57,400 2.54

53,300 2.60

50,700 2.66

46,900



8 1 / 4

57,400 2.85

53,300 2.93

50,700 2.99

46,900

3.10

46,500 1.84

46,500 1.89

46,500 1.92

46,500

1.99 2.27

6 5 / 8 H-90

7 1 / 2 7 3 / 4

55,700 2.11

55,700 2.16

53,600 2.20

49,900

(See Note 5)

8

60,300 2.39

56,300 2.45

53,600 2.49

49,900

2.58



8 1 / 4

60,300 2.69

56,300 2.75

53,600 2.80

49,900

2.90



8

55,100 2.03

55,100 2.07

55,100 2.10

55,100

2.16



8 1 / 4

65,400 2.28

65,400 2.32

65,400 2.36

61,600

2.42

72,700 2.54

68,400 2.59

65,600 2.63

61,600

2.70

8 3 / 4

72,700 2.82

68,400 2.87

65,600 2.92

61,600

2.99

NC 61

8 1 / 2



9

72,700 3.11

68,400 3.17

65,600 3.22

61,600



8

56,600 1.82

56,600 1.85

56,600 1.88

56,600

1.93

56,600

1.99



8 1 / 4

67,100 2.07

67,100 2.11

67,100 2.14

63,400

2.19

59,000

2.26

74,600 2.33

70,300 2.37

67,400 2.41

63,400

2.47

59,000

2.55

74,600 2.60

70,300 2.65

67,400 2.69

63,400

2.76

59,000

2.85

5 1 / 2 IF

8 1 / 2

3.30



8 3 / 4



9

74,600 2.89

70,300 2.95

67,400 2.99

63,400

3.06

59,000



9 1 / 4

74,600 3.20

70,300 3.26

67,400 3.30

63,400

3.39

59,000

67,800 1.88

67,800 1.91

67,800 1.93

67,800

1.97

67,800

2.02

67,200

8 3 / 4

79,500 2.12

79,500 2.15

79,500 2.18

76,700

2.23

72,100

2.28

67,200

2.36

9

88,600 2.30

84,000 2.41

81,000 2.44

76,700

2.49

72,100

2.56

67,200

2.64

9 1 / 4

88,600 2.64

84,000 2.68

81,000 2.72

76,700

2.77

72,100

2.85

67,200

2.94

88,600 2.92

84,000 2.97

81,000 3.00

76,700

3.07

72,100

3.15

67,200

3.25

8 1 / 2

6 5 / 8 FH

106

6 1 / 4

2 1 / 4 ft-lb BSR

9 1 / 2

© Grant Prideco. All rights reserved. December 2003

3.16 3.50 2.09

DRI L L

CO L L AR S

Drill Collars – Recommended Make-Up Torque and Bending Strength Ratios ft-lb (See Note 2) Size and Type Drill Collar Bore (in.) of Connection OD in.

2 1 / 2 ft-lb BSR

2 13 / 16 ft-lb BSR



9 9 1 / 4

75,800 1.87 88,800 2.08

75,800 88,800

NC 70

9 1 / 2

102,400 2.29



9 3 / 4

113,700

2.52



10

113,700

2.76

3 1 / 4 ft-lb BSR

3 ft-lb

1.89 2.10

75,800 88,800

102,400

2.32

108,800

2.55

108,800

2.79

BSR

ft-lb

3 1 / 2 BSR

ft-lb

3 3 /4 BSR

1.91 2.12

75,800 88,800

1.93 2.15

75,800 88,800

1.97 2.19

75,800 88,800

2.02 2.24

102,400

2.34

101,100

2.37

96,200

2.41

91,000

2.47

105,700

2.57

101,100

2.60

96,200

2.65

91,000

2.71

105,700

2.81

101,100

2.85

96,200

2.90

91,000

2.97



10 1 / 4

113,700

3.01

108,800

3.04

105,700

3.06

101,100

3.11

96,200

3.17

91,000

3.24



10

108,200 1.94

108,200

1.95

108,200

1.96

108,200

1.98

108,200

2.01

108,200

2.04



10 1 / 4

124,100

2.13

124,100

2.14

124,100

2.16

124,100

2.10

124,100

2.20

124,100

2.24

NC 77

10 1 / 2

140,500 2.33

140,500

2.34

140,500

2.36

140,500

2.38

135,100

2.41

129,400

2.44



10 3 / 4

154,300

2.53

149,000

2.55

145,500

2.56

140,500

2.59

135,100

2.62

129,400

2.66



11

154,300

2.75

149,000

2.77

145,500

2.78

140,500

2.81

135,100

2.84

129,400

2.89

CONNECTIONS WITH FULL FACES

8

53,500

1.90

53,500

1.94

53,500

1.96

53,500

2.01

53,500

2.07

53,500

2.16



7 H-90

8 1 / 4

63,700

2.14

63,700

2.18

63,700

2.21

63,700

2.26

61,000

2.33

56,400

2.42



(See Note 5)



8 1 / 2

74,500 2.39

72,100

2.43

69,300

2.46

65,300

2.52

61,000

2.60

56,400

2.70

8 1 / 2

60,400 1.80

60,400

1.83

60,400

1.84

60,400

1.88

60,400

1.92

60,400

1.98

8 3 / 4

72,200 2.02

72,200

2.05

72,200

2.07

72,200

2.11

72,200

2.16

72,200

2.22

9

84,400 2.25

84,400

2.28

84,400

2.31

84,200

2.35

79,500

2.40

74,500

2.47



9 1 / 4

96,300

2.49

91,600

2.53

88,600

2.55

84,200

2.60

79,500

2.66

74,500

2.74



9 1 / 2

96,300

2.75

91,600

2.78

88,600

2.81

84,200

2.87

79,500

2.93

74,500

3.02





7

5/

8

API Regular

9

73,000

1.76

73,000

1.78

73,000

1.79

73,000

1.81

73,000

1.84

73,000

1.88



7 5 / 8 H-90

9 1 / 4

86,000

1.95

86,000

1.97

86,000

1.99

86,000

2.02

86,000

2.05

86,000

2.09



(See Note 5)

9 1 / 2

8 5 / 8 API Regular

99,500 2.16

99,500

2.18

99,500

2.20

99,500

2.23

99,500

2.27

96,300

2.31

10

109,300 1.96

109,300

1.97

109,300

1.98

109,300

2.00

109,300

2.03

109,300

2.06 2.27

10 1 / 4

125,300 2.15

125,300

2.17

125,300

2.18

125,300

2.21

125,300

2.24

125,000



10 1 / 2

141,800

2.36

141,800

2.38

141,100

2.39

136,100

2.42

130,800

2.45

125,000

2.49



10 1 / 4

113,500

1.83

113,500

1.84

113,500

1.85

113,500

1.87

113,500

1.89

113,500

1.91

10 1 / 2

130,100

2.01

130,100

2.02

130,100

2.03

130,100

2.05

130,100

2.07

130,100

1.09 3.00





8 5 / 8 H-90 (See Note 5)

CONNECTIONS WITH LOW TORQUE FACES

8 3 / 4

68,100

2.70

68,100

2.73

67,300

2.80

62,800

2.88

58,100



9

74,200

2.98

71,400

3.02

67,300

3.09

62,800

3.19

58,100

3.31

9 1 / 4

73,100

2.54

73,100

2.56

73,100

2.61

73,100

2.67

73,100

2.75 3.03

7 H-90 (See Note 5)

7 5 / 8 API Regular

9 1 / 2

86,500

2.79

86,500

2.82

86,500

2.87

82,500

2.94

77,300



9 3 / 4

94,900

3.06

91,800

3.10

87,300

3.15

82,500

3.23

77,300

3.32



10

94,900

3.35

91,800

3.38

87,300

3.44

82,500

3.52

77,300

3.63 2.55



9 3 / 4

91,700

2.40

91,700

2.42

91,700

2.45

91,700

2.49

91,700

10

106,300

2.63

106,300

2.65

106,300

2.68

104,200

2.73

98,800

2.79

10 1 / 4

117,100

2.87

113,900

2.89

109,200

2.93

104,200

2.98

98,800

3.04



10 1 / 2

117,100

3.12

113,900

3.14

109,200

3.18

104,200

3.24

98,800

3.31



10 3 / 4

112,900

2.61

112,900

2.64

112,900

2.67

112,900

2.72 2.96

5/

H-90



7



(See Note 5)

8

8 5 / 8 API Regular

11

130,700

2.84

130,700

2.87

130,700

2.91

130,700



11 1 / 4

147,600

3.33

142,430

3.36

136,800

3.41

130,700

3.46



10 3 / 4

93,000

2.21

93,000

2.23

93,000

2.26

93,000

2.29





8 5 / 8 H-90

11









110,800

2.41

110,800

2.43

110,800

2.45

110,800

2.49



(See Note 5)

11 1 / 4









129,200

2.61

129,200

2.63

129,200

2.66

129,200

2.69

While every effort has been made to insure the accuracy of the tables herein, this material is presented as a reference guide only. The technical information contained herein should not be construed as a recommendation. Grant Prideco cannot assume responsibility for the results obtained through the use of this material. No expressed or implied warranty is intended.

107

G RANT

P RIDECO

CARE AND MAINTENANCE Initial Make-up

E

ven though quality connections are heavily coated with phosphate, thread damage is not always prevented. A generous and thorough application of high-quality thread dope (40 to 60% by weight metallic zinc minimum) will help minimize galling.

New connections should be “walked in” with chain tongs. Always use the recommended make-up torque for the thread

design. Exercise care to maintain calibrated torque measuring and indicating gauges for future use. After initial make-up, break-out the connection, clean and inspect the threads, faces and shoulders. Repair any minor damage. Re-lubricate and re-torque the connection. Repeat break-out and make-up a third time before going in the hole. Monitor break-out torque. It should be the same or less than the make-up torque. High break-out torque is an indication of problems and the connection should be inspected for damage.

Maintenance Use thread protectors on both connections when handling drill collars. Rotate breaks on each trip. Clean and inspect the individual connections. Qualified personnel should periodically conduct a magnetic particle/black light inspection. Collars that are left idle or put in storage should be cleaned, inspected, repaired, and rust-proofed, as necessary, before installing thread protectors.

Bending Strength Ratios Sizes less than 6” should have a BSR of 2.25:1 to 2.75:1. Conditions that require high rpm and small collars compared to the hole size, use 2.25:1 to 3.00:1. If the rpm is kept low and the collars are closer to the hole size, use 2.25:1 to 3.20:1. In corrosive environments, use 2.50:1 to 3.00:1. Although the current industry BSR calculation for single-shoulder RSC connection types may still be applicable for double-shoulder connections (HT, XT, GPDS), the appropriate target ranges are yet to be defined due to limited industry experience and testing of available types/sizes. Testing performed to date indicates that current target BSR of 2.5 does not apply to tested double-shoulder connections. Just as target BSR for single shoulder RSC’s has taken many years of industry experience to define, the same may be true for these relatively new double-shoulder offerings. Additionally, target BSR’s for double-shoulder connections may likely vary between connection types (i.e. GPDS vs. XT). Current industry target BSR ranges should not be used as an indicator of double-shoulder acceptance/rejection.

108

© Grant Prideco. All rights reserved. December 2003