DRILL Collars
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Traceability
Drill collar material and process
traceability are maintained from
receipt of mill certified raw
materi-al to completion of materi-all the
manu-facturing. 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.
d
rill collars are manufactured from AISI
4142
H-
4145
H modified steel, and are
supplied in the “as rolled” surface
fin-ish condition. Alternative surface finfin-ishes can be
provided. Drill collars are trepanned and drifted
to API Spec. 7 Latest Edition. Full-length
heat-treatment 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
70
0F are
guaran-teed one inch below the surface.
tensile properties are determined by tests on cylindricalspeci-mens 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.
Materials Mechanical Properties
drill collar Minimum Minimum Minimum
diameter Yield Strength tensile Strength Hardness
in. psi psi BHn
3 1/8 thru 6 7/8 110,000 140,000 285
7 thru 11 100,000 135,000 285
98
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-sented in API RP
7
G Latest Edition. Common sizes
and styles are summarized on the next page. In
addition, other connections such as OH, FH, PAC,
WO, SLH
90
, SH, and H
90
, are available to meet
spe-cific needs.
Phosphate Coating
All connections are phosphate-coated to improve
resistance to galling.
cold rolling
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.
the cold-rolling process consists of com-pressing metal fibers by means of a roller.
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
con-centrations 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 NC
23
, NC
26
(2
3/
8
IF) and
NC31 (2
7/
8IF) do not have sufficient metal to accommodate stress relief features.
Srt
tMStress relief thread Form
Grant Prideco’s patented SRT
TMmodified
thread form can be applied to BHA
connec-tions to reduce stress in the thread roots and
significantly improve connection fatigue life.
The stress reduction is accomplished by
machining an enlarged radius into the root
of the stab-flank thread. The SRT
TMthread form
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.
aPi pin stress relief groove andaPi boreback box remove unen-gaged threads in highly stressed areas of the drill collar connec-tion.
© Grant Prideco. All rights reserved. December 2003
The enlarged root radius of the modi-fied thread form reduces the stress concentration at the thread root.
enlarged thread
root radius aPi thread Form
product specifications
Drill collars are manufactured in compliance
with the following API standards:
• aPi Specification 7 Latest edition
• aPi recommended Practice 7G Latest edition
• aPi Specification Q1 Latest edition
drill collar drill collar Bore approximate Section displacement typical Bending
number diameter Length Weight Modulus (open ended) Strength
(1) ratio
in. in. ft lb/ft. ( in.3) US gal/ft
NC 23-31 3 1/ 8 1 1/4 30 22.00 2.919 0.337 2.57:1 NC 26-35 (2 3/ 8 IF) 3 1/2 1 1/2 30 26.70 4.067 0.408 2.42:1 NC 31-41 (2 7/ 8 IF) 4 1/8 2 30 or 31 33.65 6.510 0.515 2.43:1 NC 35-47 4 3/ 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 2 13/16 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 NC 46-65 (4 IF) 6 1/2 2 1/4 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 NC 50-70 (4 1/2 IF) 7 2 1/4 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 NC 50-72 (4 1/ 2 IF) 7 1/4 2 13/16 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 6 5/ 8 API Reg 8 1/4 2 13/16 30 or 31 161.81 54.382 2.472 2.93:1 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.
drill collar data
+ 1/16”
-0”
Summary of connection Fea results
Stress intensity at Last engaged Box thread root (psi)
Model description 10 deg/100 ft 20 deg/100ft
Standard Box 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
SRT
TMStress Relief Thread Form
(Cont.)
In addition to providing increased connection
fatigue life, SRT
TMboxes reduce the overall
length required for recut by more than one
inch when compared to boxes with API stress
relief features.
100
© Grant Prideco. All rights reserved. December 2003G
rant Prideco offers optional slip and elevator
recesses to improve handling efficiency and
safe-ty. 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.
3” r cold Work Shoulder area 1” radius Shoulder area a B 2” radius c 2” radius 3” 3” 16” 18” 20” c B a
SLIP AND ELEVATOR RECESSES
drill collar elevator Slip elevator
diameter recess recess recess
diameter diameter radius
a B c r
in. in. in. in.
4 1/8 3 11/16 3 3/4 1/8 4 3/4 4 1/4 4 3/8 1/8 5 4 1/2 4 5/8 1/8 6 5 3/8 5 1/2 1/8 6 1/4 5 5/8 5 3/4 1/8 6 1/2 5 7/8 6 1/8 6 3/4 6 6 1/4 3/16 7 6 1/4 6 1/2 3/16 7 1/4 6 1/2 6 3/4 3/16 7 3/4 7 7 1/4 3/16 8 7 1/4 7 1/2 3/16 8 1/4 7 1/2 7 3/4 3/16 9 8 1/8 8 1/2 1/4 9 1/2 8 5/8 9 1/4 9 3/4 8 7/8 9 1/4 1/4 10 9 1/8 9 1/2 1/4 11 10 1/8 10 1/2 1/4
Slip and elevator recesses
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.
102
Grant Prideco Offers Numerous Hardfacing
Options:
• S
MOOTHX
®• S
uperS
moothX
®• Grant prideco 1000 S
erieStmhardfacing
• other
Box end with
Slip recess only
Grant Prideco’s patented hardfacing that provides a smooth
sur-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,
provides economical protection in open hole applications.
Grant Prideco offers custom engineering hardfacing for specific
applications.
Pin end
Slip and elevator recess
Box end with
1” 1” 1” 10” 30” Min. 10” 1” 1” 10” 4”
HARDFACING
High Torque Applications
G
rant Prideco Double Shouldered
connections (HT, XT, GPDS) are
patented, high-performance
con-nections that offers significantly more
tor-sional strength than standard API
connec-tions 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
occur-rence of differential pressure sticking.
Spiral prevents differential sticking Without Spiral
DOUBLE SHOULDERED CONNECTIONS
104
Size and type drill collar Bore (in.)
of connection od 1 1 1/4 1 1/2 1 3/4 2 2 1/4 2 1/2 2 13/16 in. ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr 3 2,500 2.03 2,500 2.17 2,500 2.49 aPi nc 23 3 1/8 3,300 2.40 3,300 2.57 2,600 2.94
3
1/4 4,000 2.81 3,400 3.00 2,600 3.43 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 2 3/8 IF aPi nc 26 3 1/2 4,600 2.25 4,600 2.42 3,700 2.76 2 7/8 Slim Hole 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 2 7/8 XH 3 3/4 4,100 1.53 4,100 1.58 4,100 1.68 3 1/2 dbl Streamline 3 7/8 5,400 1.76 5,400 1.82 5,400 1.93 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 4 1/8 6,500 2.09 6,500 2.16 6,500 2.27 6,500 2.48 5,700 2.85 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 7,400 2.59 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 4 1/2 Slim Hole 5 1/2 16,200 3.10 14,500 3.23 12,900 3.43 11,000 3.77 8,300 4.54notes: (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 pow-dered metallic zinc, or 60% by weight of finely powpow-dered metallic lead, with no more than 0.3% total active sulfur (reference the caution regard-ing 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.
ft-lb (See note 2)
ft-lb (See note 2)
Size and type drill collar Bore (in.)
of connection od 1 3/4 2 2 1/4 2 1/2 2 13/16 3 3 1/4 in. ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr 4 3/4 8,800 1.46 8,800 1.51 8,800 1.59 8,800 1.71 8,800 1.99 3 1/2 H-90 5 12,800 1.83 12,800 1.89 12,800 1.99 12,800 2.15 10,400 2.49 (See note 5) 5 1/4 17,100 2.23 16,900 2.31 15,100 2.43 13,200 2.43 10,400 3.04 5 1/2 18,500 2.67 16,900 2.76 15,100 2.91 13,200 3.14 10,400 3.64 5 10,900 1.61 10,900 1.66 10,900 1.74 10,900 1.86 10,900 2.11 4 Full Hole 5 1/4 15,300 1.98 15,300 2.04 15,300 2.14 15,000 2.29 12,100 2.60 nc 40 5 1/2 20,000 2.38 18,900 2.46 17,000 2.57 15,000 2.75 12,100 3.12 4 Mod. open 5 3/4 20,500 2.62 18,900 2.91 17,000 3.04 15,000 3.25 12,100 3.70 4 1/2 dbl. Streamline 6 20,500 3.29 18,900 3.39 17,000 3.55 15,000 3.79 12,100 4.31 5 1/4 12,600 1.47 12,600 1.51 12,600 1.56 12,600 1.64 12,600 1.80 5 1/2 17,400 1.80 17,400 1.85 17,400 1.91 17,400 2.01 16,500 2.20 4 H-90 5 3/4 22,500 2.17 22,500 2.22 21,700 2.29 19,500 2.41 16,500 2.84 (See note 3) 6 25,400 2.55 23,700 2.61 21,700 2.70 19,500 2.84 16,500 3.12 6 1/4 25,400 2.97 23,700 3.04 21,700 3.15 19,500 3.31 16,500 3.63 5 1/2 15,600 1.89 15,600 1.94 15,600 2.00 15,600 2.10 15,600 2.30 4 1/2 aPi regular 5 3/4 20,600 2.24 20,600 2.29 20,600 2.37 19,600 2.49 16,600 2.72 6 25,400 2.62 23,700 2.65 21,700 2.77 19,600 2.91 16,600 3.18 6 1/4 25,400 3.02 23,700 3.09 21,700 3.20 19,600 3.35 16,600 3.67 5 3/4 20,900 1.99 20,900 2.04 20,900 2.10 20,900 2.20 18,200 2.39 nc 44 6 26,500 2.36 25,500 2.41 23,500 2.49 21,300 2.61 18,200 2.84 6 1/4 27,300 2.76 25,500 2.82 23,500 2.91 21,300 3.04 18,200 3.31 6 1/2 27,300 3.19 25,500 3.25 23,500 3.36 21,300 3.51 18,200 3.82 5 1/2 13,000 1.60 13,000 1.85 13,000 1.71 13,000 1.85 13,000 1.93 5 3/4 18,100 1.92 18,100 1.97 18,100 2.06 18,100 2.22 17,900 2.36 4 1/2 FH 6 23,600 2.28 23,600 2.33 23,000 2.42 19,900 2.81 17,900 2.76 6 1/4 27,300 2.64 25,300 2.71 23,000 2.82 19,900 3.04 17,900 3.24 6 1/2 27,300 3.03 25,300 3.12 23,000 3.25 19,900 3.50 17,900 3.73 4 1/2 XH 5 3/4 17,700 1.68 17,700 1.74 17,700 1.87 17,700 1.97 nc 46 6 23,400 2.02 23,400 2.09 22,400 2.24 20,300 2.37 4 iF 6 1/4 28,000 2.38 25,700 2.47 22,400 2.64 20,300 2.79 5 dbl. Streamline 6 1/2 28,000 2.77 25,700 2.87 22,400 3.07 20,300 3.25 4 1/2 Mod. open 6 3/4 28,000 3.18 25,700 3.30 22,400 3.57 20,300 3.74 5 3/4 18,000 1.83 18,000 1.69 18,000 1.80 18,000 1.90 6 23,700 1.95 23,700 2.02 23,200 2.16 21,100 2.28 4 1/2 H-90 6 1/4 28,700 2.30 26,400 2.38 23,200 2.54 21,100 2.69 (See note 5) 6 1/2 28,700 2.88 26,400 2.77 23,200 2.96 21,100 3.12 6 3/4 28,700 3.08 26,400 3.19 23,200 3.40 21,100 3.59 6 1/4 25,400 1.80 25,400 1.85 25,400 1.95 25,400 2.03 24,000 2.18 5 H-90 6 1/2 31,900 2.12 31,900 2.17 29,400 2.29 27,200 2.38 24,000 2.56 (See note 5) 6 3/4 35,300 2.45 32,900 2.52 29,400 2.65 27,200 2.76 24,000 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
ft-lb 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.
106
Size and type drill collar Bore (in.)
of connection od 2 1/4 2 1/2 2 13/16 3 3 1/4 3 1/2 3 3/4 in. ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr lb/ft BSr 6 1/4 23,000 1.59 23,000 1.63 23,000 1.71 23,000 1.77 23,000 1.89 4 1/2 iF 6 1/2 29,700 1.89 29,700 1.93 29,700 2.03 29,700 2.10 26,700 2.24 aPi nc 50 6 3/4 36,700 2.21 35,800 2.26 32,300 2.37 30,000 2.46 26,700 2.62 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 5 1/2 dbl. Streamline 7 1/2 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 5 1/2 H-90 7 42,000 2.25 40,100 2.30 36,500 2.39 34,100 2.46 30,800 2.60 (See note 5) 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 5 1/2 aPi regular 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 3.13 7 1/2 42,500 3.04 39,900 3.11 36,200 3.23 33,900 3.34 30,500 3.53 7 32,800 1.64 32,800 1.67 32,800 1.72 32,800 1.76 32,800 1.83 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 7 1/2 49,700 2.20 49,700 2.24 47,800 2.30 45,200 2.36 41,500 2.45 7 3/4 54,500 2.50 51,700 2.54 47,800 2.62 45,200 2.68 41,500 2.79 7 1/4 40,500 2.05 40,500 2.11 40,500 2.16 40,500 2.24 nc 56 7 1/2 50,000 2.33 48,200 2.39 45,600 2.45 42,100 2.55 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 6 5/8 aPi regular 7 3/4 55,600 2.24 53,300 2.30 50,700 2.35 46,900 2.43 8 57,400 2.54 53,300 2.60 50,700 2.66 46,900 2.75 8 1/4 57,400 2.85 53,300 2.93 50,700 2.99 46,900 3.10 7 1/2 46,500 1.84 46,500 1.89 46,500 1.92 46,500 1.99 6 5/8 H-90 7 3/4 55,700 2.11 55,700 2.16 53,600 2.20 49,900 2.27 (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 nc 61 8 1/2 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 9 72,700 3.11 68,400 3.17 65,600 3.22 61,600 3.30 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 5 1/2 iF 8 1/2 74,600 2.33 70,300 2.37 67,400 2.41 63,400 2.47 59,000 2.55 8 3/4 74,600 2.60 70,300 2.65 67,400 2.69 63,400 2.76 59,000 2.85 9 74,600 2.89 70,300 2.95 67,400 2.99 63,400 3.06 59,000 3.16 9 1/4 74,600 3.20 70,300 3.26 67,400 3.30 63,400 3.39 59,000 3.50 8 1/2 67,800 1.88 67,800 1.91 67,800 1.93 67,800 1.97 67,800 2.02 67,200 2.09 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 6 5/8 FH 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 9 1/2 88,600 2.92 84,000 2.97 81,000 3.00 76,700 3.07 72,100 3.15 67,200 3.25
ft-lb (See note 2)
Drill Collars – Recommended Make-Up Torque and Bending Strength Ratios
Size and type drill collar Bore (in.) of connection od 2 1/2 2 13/16 3 3 1/4 3 1/2 3 3/4 in. ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr ft-lb BSr 9 75,800 1.87 75,800 1.89 75,800 1.91 75,800 1.93 75,800 1.97 75,800 2.02 9 1/4 88,800 2.08 88,800 2.10 88,800 2.12 88,800 2.15 88,800 2.19 88,800 2.24 nc 70 9 1/2 102,400 2.29 102,400 2.32 102,400 2.34 101,100 2.37 96,200 2.41 91,000 2.47 9 3/4 113,700 2.52 108,800 2.55 105,700 2.57 101,100 2.60 96,200 2.65 91,000 2.71 10 113,700 2.76 108,800 2.79 105,700 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 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 7 5/8 aPi regular 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 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 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 8 5/8 aPi regular 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 2.27 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 8 5/8 H-90 (See note 5) 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 8 3/4 68,100 2.70 68,100 2.73 67,300 2.80 62,800 2.88 58,100 3.00 7 H-90 (See note 5) 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 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 3.03 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 9 3/4 91,700 2.40 91,700 2.42 91,700 2.45 91,700 2.49 91,700 2.55 7 5/8 H-90 10 106,300 2.63 106,300 2.65 106,300 2.68 104,200 2.73 98,800 2.79 (See note 5) 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 8 5/8 aPi regular 11 130,700 2.84 130,700 2.87 130,700 2.91 130,700 2.96 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
ft-lb (See note 2)
connectionS WitH LoW torQUe FaceS
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.
connectionS WitH FULL FaceS
