Types of Drill Collars we supply:
PONY
Also known as a Short Drill Collar (SDC), pony collars measure less than the standard drill collar length. While our average drill collar length is 31’ 6”, pony collars can measure between just five and 15 feet.
SPIRAL
These collars are machined with spiral grooves throughout their length to help minimize wall contact, which dramatically reduces the risk of sticking during operations.
SLICK
These drill collars are designed with a smooth surface that comes just as they were mill rolled. These designs are preferable when you need more weight and contact with the wellbore wall.
FLEX
Thicker portions of the pipe wall are known as upsets. Used in high-stress applications, these collars feature center upsets which reduce hole drag—improving overall rate of penetration and maintaining drill string steer-ability.
STEEL AND NON-MAG
Our non-magnetic drilling collars are typically made slick, but can be spiral-machined as needed. These collars are often used in directional drilling applications to avoid interference.
HIGH-PERFORMANCE COATINGS
For enhanced resistance to corrosion on non-magnetic collars, Stabil Drill applies a mechanical bore treatment (RSC or roller burnishing) and shot peening on outside diameters. Stabil Drill’s exclusive MAGCOAT process can also be applied to extend tool life and reduce galling by up to ninety-nine percent.
Connection Features
API connections
All API connections (regular, NC, H90, and PAC) comply with dimensional requirements specified in API Spec. 7-2 and guidelines presented in API RP7G. Other connections are available to meet specific needs.
Phosphate coating
All connections are phosphate-coated to improve resistance to galling.
Stress relief features
API pin stress relief groove and API box boreback 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. 7-2.
Hard Banding Options
Arnco 100XT, Arnco 300XT, TCS-8000 etc.
Drill Collars Specifications
DRILL COLLAR NUMBER (1) | DRILL COLLAR DIAMETER | BORE + 1/16″ -0″ | LENGTH | APPROXIMATE WEIGHT OF 31 FT DRILL COLLAR | TYPICAL BENDING STRENGTH RATION | ||||
IN | MM | IN | MM | FT | M | LB | KG | ||
NC 23-31 | 3,125 | 79,375 | 1 1/4 | 31,75 | 30 | 91,44 | 660 | 299,376 | 2.57:1 |
NC 26-35 (2 3/8 IF) | 3,5 | 88,9 | 1 1/2 | 38,1 | 30 | 91,44 | 801 | 363,3336 | 2.42:1 |
NC 31-41 (2 7/8 IF) | 4,125 | 104,775 | 2 | 50,8 | 30-31 | 91.44 – 94.48 | 1043 | 473,1048 | 2.43:1 |
NC 35-47 | 4,75 | 120,65 | 2 | 50,8 | 30-31 | 91.44 – 94.48 | 1451 | 658,1736 | 2.58:1 |
NC 38-50 (3 1/2 IF) | 5 | 127 | 2 1/4 | 57,15 | 30-31 | 91.44 – 94.48 | 1652 | 749,3472 | 2.38:1 |
NC 44-60 | 6 | 152,4 | 2 1/4 | 57,15 | 30-31 | 91.44 – 94.48 | 2561 | 1161,6696 | 2.49:1 |
NC 44-60 | 6 | 152,4 | 2 13/16 | 71,4375 | 30-31 | 91.44 – 94.48 | 2353 | 1067,3208 | 2.84:1 |
NC 44-62 | 6,25 | 158,75 | 2 1/4 | 57,15 | 30-31 | 91.44 – 94.48 | 2806 | 1272,8016 | 2.91:1 |
NC 46-62 (4 IF) | 6,25 | 158,75 | 2 13/16 | 71,4375 | 30-31 | 91.44 – 94.48 | 2598 | 1178,4528 | 2.63:1 |
NC 46-65 (4 IF ) | 6,5 | 165,1 | 2 1/4 | 57,15 | 30-31 | 91.44 – 94.48 | 3085 | 1399,356 | 2.76:1 |
NC 46-65 (4 IF ) | 6,5 | 165,1 | 2 13/16 | 71,4375 | 30-31 | 91.44 – 94.48 | 2877 | 1305,0072 | 3.05:1 |
NC 46-67 ( 4IF ) | 6,75 | 171,45 | 2 1/4 | 57,15 | 30-31 | 91.44 – 94.48 | 3364 | 1525,9104 | 3.18:1 |
NC 50-70 (4 1/2 IF) | 7 | 177,8 | 2 1/4 | 57,15 | 30-31 | 91.44 – 94.48 | 3643 | 1652,4648 | 2.54:1 |
NC 50-70 (4 1/2 IF) | 7 | 177,8 | 2 13/16 | 71,4375 | 30-31 | 91.44 – 94.48 | 3434 | 1557,6624 | 2.73:1 |
NC 50-72 (4 1/2 IF) | 7,25 | 184,15 | 2 13/16 | 71,4375 | 30-31 | 91.44 – 94.48 | 3714 | 1684,6704 | 3.12:1 |
NC 56-77 | 7,75 | 196,85 | 2 13/16 | 71,4375 | 30-31 | 91.44 – 94.48 | 4337 | 1967,2632 | 2.70:1 |
NC 56-80 | 8 | 203,2 | 2 13/16 | 71,4375 | 30-31 | 91.44 – 94.48 | 4675 | 2120,58 | 3.02:1 |
6 5/8 API Reg | 8,25 | 209,55 | 2 13/16 | 71,4375 | 30-31 | 91.44 – 94.48 | 5016 | 2275,2576 | 2.93:1 |
NC 61-90 | 9 | 228,6 | 2 13/16 | 71,4375 | 30-31 | 91.44 – 94.48 | 6070 | 2753,352 | 3.17:1 |
7 5/8 API Reg | 9,5 | 241,3 | 3 | 76,2 | 30-31 | 91.44 – 94.48 | 6727 | 3051,3672 | 2.81:1 |
NC 70-97 | 9,75 | 247,65 | 3 | 76,2 | 30-31 | 91.44 – 94.48 | 7130 | 3234,168 | 2.57:1 |
NC 70-100 | 10 | 254 | 3 | 76,2 | 30-31 | 91.44 – 94.48 | 7532 | 3416,5152 | 2.81:1 |
8 5/8 API Reg | 11 | 279,4 | 3 | 76,2 | 30-31 | 91.44 – 94.48 | 9269 | 4204,4184 | 2.84:1 |
SLIP AND ELEVATOR RECESS | |||||||
DRILL COLLAR DIAMETER | ELEVATOR RECESS DIAMETER | SLIP RECESS DIAMETER | ELEVATOR RECESS RADIOUS | ||||
IN | MM | IN | MM | IN | MM | IN | MM |
4,125 | 104,775 | 3,6875 | 93,6625 | 3,75 | 95,25 | 0,125 | 3,175 |
4,75 | 120,65 | 3,25 | 82,55 | 4,375 | 111,125 | 0,125 | 3,175 |
5 | 127 | 4,5 | 114,3 | 4,63 | 117,602 | 0,125 | 3,175 |
6 | 152,4 | 5,375 | 136,525 | 5,5 | 139,7 | 0,125 | 3,175 |
6,25 | 158,75 | 5,625 | 142,875 | 5,75 | 146,05 | 0,125 | 3,175 |
6,5 | 165,1 | 5,875 | 149,225 | 6 | 152,4 | 0,125 | 3,175 |
6,75 | 171,45 | 6 | 152,4 | 6,25 | 158,75 | 3/16 | 4,76 |
7 | 177,8 | 6,25 | 158,75 | 6,5 | 165,1 | 3/16 | 4,76 |
7,25 | 184,15 | 6,5 | 165,1 | 6,75 | 171,45 | 3/16 | 4,76 |
7,75 | 196,85 | 7 | 177,8 | 7,25 | 184,15 | 3/16 | 4,76 |
8 | 203,2 | 7,25 | 184,15 | 7,5 | 190,5 | 3/16 | 4,76 |
8,25 | 209,55 | 7,5 | 190,5 | 7,75 | 196,85 | 3/16 | 4,76 |
9 | 228,6 | 8,125 | 206,375 | 8,5 | 215,9 | 0,25 | 6,35 |
9,5 | 241,3 | 8,625 | 219,075 | 9 | 228,6 | 0,25 | 6,35 |
9,75 | 247,65 | 8,875 | 225,425 | 9,25 | 234,95 | 0,25 | 6,35 |
10 | 254 | 9,125 | 231,775 | 9,5 | 241,3 | 0,25 | 6,35 |
11 | 279,4 | 10,125 | 257,175 | 10,5 | 266,7 | 0,25 | 6,35 |
Made by our partner manufacturing facilities:
USA |
Australia |
India |
Singapore |
China