Description
As an important part of drill string, drill collar can supply the drill bit and increase the rigidity of drill string. Drill collar are manufactured strictly according to API Spec7-1 standard with material of AISI 4145 Mod. We supply slick drill collars, spiral drill collars, etc. The size of drill collar we can provide is from 3.1/8 to 11 inches. We can also provide other drill collars at customers’ specific request.
- Types: Spiral / Slick
- Standards: API 7-1
- Sizes: OD/ID per spec (drawings on request)
- Inspection: UT/EMI, dimensional, drift; MTC provided
- Lead time: 1–4 weeks (expedite available)
Related:
Drill String & BHA ·
Stabilizers
Non-Mag Drill Collar
RIGRS Non-Mag Drill Collar provide the required weight on bit, and will not interfere with the directional drilling ability.
Spiral Non-Mag Drill Collar
RIGRS Spiral Non-Mag Drill Collar is designed to allow greater flow area for drilling fluids, while providing the benefits of non-mag steel for complex drilling programs.
Flex Non-Mag Drill Collar
Flex Non-Mag Drill Collar is thinner and more flexible than standard drill collar. Their ability to make short radius turns, bend for high build angles, and pass through severe doglegs makes them ideal for use in directional and horizontal applications. Manufactured with non-mag steel, this drill collar is well suited for housing MWD equipment.
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.
Each drill collar is fully inspected by internal inspection dept. All data obtained are recorded on the inspection certificate furnished with each drill collar.
| Size | O.D | I.D. | Code | Thread | Length | Weight |
| (in) | (mm) | (in) | (mm) | (kg) | ||
| 3 1/8 | 79.4 | 2001/1/4 | NC23-31 | NC23 | 9140 | 298 |
| 3 1/2 | 88.9 | 2001/1/2 | NC26-35 | NC26 | 9140 | 364 |
| 4 1/8 | 104.8 | 2 | NC31-41 | NC31 | 9140/9450 | 474/490 |
| 4 3/4 | 120.6 | 2 | NC35-47 | NC35 | 9140/9450 | 674/697 |
| 5 | 127 | 2002/1/4 | NC38-50 | NC38 | 9140/9450 | 725/749 |
| 6 | 152.4 | 2002/1/4 | NC44-60 | NC44 | 9140/9450 | 1125/1163 |
| 6 | 152.4 | 2-13/16 | NC44-60 | NC44 | 9140/9450 | 1022/1056 |
| 6 1/4 | 158.8 | 2002/1/4 | NC44-62 | NC44 | 9140/9450 | 1237/1279 |
| 6 1/4 | 158.8 | 2-13/16 | NC46-62 | NC44 | 9140/9450 | 1134/1172 |
| 6 1/2 | 165.1 | 2002/1/4 | NC46-65 | NC46 | 9140/9450 | 1352/1398 |
| 6 1/2 | 165.1 | 2-13/16 | NC46-65 | NC50 | 9140/9450 | 1249/1291 |
| 6 3/4 | 171.4 | 2002/1/4 | NC46-67 | NC46 | 9140/9450 | 1471/1521 |
| 7 | 177.8 | 2002/1/4 | NC50-70 | NC50 | 9140/9450 | 1597/1651 |
| 7 | 177.8 | 2-13/16 | NC50-70 | NC50 | 9140/9450 | 1494/1545 |
| 7 1/4 | 184.2 | 2-13/16 | NC50-72 | NC50 | 9140/9450 | 1625/1680 |
| 7 3/4 | 196.8 | 2-13/16 | NC56-77 | NC56 | 9140/9450 | 1895/1960 |
| 8 | 203.2 | 2-13/16 | NC56-80 | NC56 or 6- 5/8REG | 9140/9450 | 2040/2109 |
| 8 1/4 | 209.6 | 2-13/16 | 6-5/8REG | 6-5/8REG | 9140/9450 | 2188/2263 |
| 9 | 228.6 | 2-13/16 | NC61-90 | NC61 | 9140/9450 | 2658/2748 |
| 9 1/2 | 241.3 | 2-13/16 | 7-5/8REG | 7-5/8REG | 9140/9450 | 2954/3054 |
| 9 3/4 | 247.6 | 3 | NC70-97 | NC70 | 9140/9450 | 3127/3234 |
| 10 | 254 | 3 | NC70-100 | NC70 | 9140/9450 | 3308/3421 |
| 11 | 279.4 | 3 | 8-5/8REG | 8-5/8REG | 9140/9450 | 4072/4210 |
| Mechanical properties: <7 inch Drill Collar: Yield Strength≥758MPa, Tensile Strength≥965MPa, Four times elongation ≥13%, Impact energy Ak≥54J (Single impact work≥47J, Average≥54J), Hardness range: 285HB~341HB ≥7inch Drill Collar: Yield Strength≥689MPa, Tensile Strength≥931MPa, Four times elongation≥13%, Impact energy Ak≥54J (Single impact work≥47J, Average≥54J), Hardness range 285HB~341HB | ||||||
