Product introduction:
Usage: Drill collars are used to provide weight on bit so that drill pipes are kept in tension. Especially drill collars can keep drill bits centralized and hole track by large rigidity
Material: AISI 4145H, 4145H Mod and Non-magnetic material.
Standard: API Spec7, API Spec7-1 and SY/T Standard. ALSO WE CAN SUPPLY DS-1 and NS-1 STANDARD.
Hard band: Arnco100XT, Arnco200XT and Arnco300XT; Botn1000, Botn3000, TCS8000, TCS-Titanium, Armacor M etc. Also we can make according to customers' requirements.
Size: OD: 3 1/8"~~11"; ID: 1 1/2"Min. Length:10'~~31'
Detail specification
Mechanical Property of Drill Collar | ||||||
OD | Yield Strength | Tensile Strength | Elongation | Brinell Hardness HB | Charpy | |
mm | in inch | σ 0.2 Mpa | σ b Mpa | 4% | AKVJ | |
79.4-171.4 | 3 1/8-6 3/4 | ≥758 | ≥965 | ≥13 | 285-341 | ≥54 |
177.8-279.4 | 7-11 | ≥689 | ≥930 | |||
Stress Relief Groove for Thread Connection | |||||
Style of Connection | Length between Inner Thread Shoulder and the last Dens | Diameter of Inner Thread | Taper of the Hole nest to inner Thread | Outer Thread Diameter | Length between alternative Inner Thread Shoulder and Stress Relief Groove |
±1.59mm | Dcb+0.40,-0 | ±20.83 | DRG+0 -0.79 | LRG +0 -3.18 | |
mm | mm/m | mm | mm | ||
NC35 | 82.6 | 82.15 | 166.67 | 82.15 | 85.73 |
NC38(3 1/2IF) | 88.9 | 88.11 | 166.67 | 89.3 | 92.08 |
NC44 | 101.6 | 101.6 | 166.67 | 106.36 | 104.78 |
NC46(4IF) | 101.6 | 106.76 | 166.67 | 109.93 | 104.78 |
NC50(4 1/2IF) | 101.6 | 117.48 | 166.67 | 120.65 | 104.78 |
NC56 | 114.3 | 121.84 | 250 | 134.14 | 117.48 |
NC61 | 127 | 132.95 | 250 | 149.25 | 130.18 |
NC70 | 139.7 | 152 | 250 | 171.05 | 142.88 |
6 5/8REG | 114.3 | 134.14 | 166.67 | 137.72 | 117.48 |
7 5/8REG | 120.7 | 133.35 | 250 | 162.72 | 123.83 |
8 5/8REG | 123.8 | 149.25 | 250 | 184.94 | 127 |
Note: The connection of NC23,26,31 and 2 3/8IF are without stress relief groove mould for their thin wall. | |||||
Company introduction
Xi'an KINGWELL OILFIELD MACHINERY Co., Ltd. (KINGWELL) is a highly reputable supplier for oilfield equipment and services to Oil & Gas industries and provides complete solutions.
With over 10 years developing, we were developed from the beginning drilling service to manufacture factory who produce OCTG, drilling tools, DST tools and Solid control products.
KINGWELL have experienced team, stronger enough to meet any challenge, we do believe honest is the base of business and cooperation; our aim is to build solid relationship with any part of honest. kingwell can provide highly efficient services to its clients resulting in accurate and timely deliveries at the best prices. Our products have been exported to Europe, American and Middle East.
Our main product drilling tools include: drill pipe, drill collar, heavy weight drill pipe, stabilizer, etc.
