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DRILL COLLAR
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Above data based on drill collar nominal dimensions and 31-ft OAL. Spiral assumed to reduce slick drill collar weight by 4%.
Spiral Drill CollarStandard slip 63⁄4-in OD with NC-50 connection
Copyright © 2015 Schlumberger. All rights reserved. 15-DT-0015 DRILCO.com
26 in
18 in
3 in
31-ft Overall Length
(OAL)
NC–50 pin with API relief groove
NC–50 box with boreback
42 in
75 in
12 in
63⁄4-in diameter
61⁄2-in diameter
63⁄4-in diameter
61⁄4-in diameter slip recess
213⁄16-in bore
Drill Collar SpecificationsWeight, lbm/ft [kg/m] 88.23 [131.30]
Displacement open ends, galUS/ft [L/m] 1.32 [16.39]
Capacity, galUS/ft [L/m] 0.313 [3.89]
Drift diameter, in [cm] 211⁄16 [6.83]
Connection Data SpecificationsConnection size NC50 (41⁄2-in IF)
OD, in [cm] 63⁄4 [17.15]
ID, in [cm] 213⁄16 [7.14]
API recommended minimum makeup torque, ft.lbf [N.m] 32,277 [43,761.74]
Torsional yield, ft.lbf [N.m] 56,807 [77,019.95]
Bending strength ratio 2.366
Torsional values based on API drill collar thread compound with 1.0 API friction factor.
Material SpecificationsMaterial AISI 4145 H modified,
Q and T
Yield strength, psi 110,000 minimum
P/N 09013461
