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Zhong Yuan Special Steel Co.,Ltd.
Registered Address:China 河南 济源
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Our company is the major supplier of CNPC and CPCC. Drill collars is produced by AISI 4145H chromium molybdenum steel as API specification and implementation of SY / T5144 standard, which can be cold thread rolling, copper or phosphate processing, machine special double shoulder screw thread and other specifications.We can produce the maximum outer diameter of 14 inches collars. Currently our company has an annual drill collars 20,000 units capacity, which are sold throughout the major oil fields, and exported abroad.
钻铤的标准尺寸、内径及螺纹
| 钻铤编号 | 外径D | 内径d | 长度L mm | 台肩倒角 直径DF mm | 弯曲强度比 | ||
| mm | in | mm | in | ||||
| NC23-31 | 79.4 | 3 1/8 | 31.8 | 1 1/4 | 9150 | 76.2 | 2.57:1 |
| NC26-35 | 88.9 | 3 1/2 | 38.1 | 1 1/2 | 9150 | 82.9 | 2.42:1 |
| NC31-41 | 104.8 | 4 1/8 | 50.8 | 2 | 9150或9450 | 100.4 | 2.43:1 |
| NC35-47 | 120.7 | 4 3/4 | 50.8 | 2 | 9150或9450 | 114.7 | 2.58:1 |
| NC38-50 | 127.0 | 5 | 57.2 | 2 1/4 | 9150或9450 | 121.0 | 2.38:1 |
| NC44-60 | 152.4 | 6 | 57.2 | 2 1/4 | 9150或9450 | 144.5 | 2.49:1 |
| NC44-60 | 152.4 | 6 | 71.4 | 2 13/16 | 9150或9450 | 144.5 | 2.84:1 |
| NC44-62 | 158.8 | 6 1/4 | 57.2 | 2 1/4 | 9150或9450 | 149.2 | 2.91:1 |
| NC46-62 | 158.8 | 6 1/4 | 71.4 | 2 13/16 | 9150或9450 | 150.0 | 2.63:1 |
| NC46-65 | 165.1 | 6 1/2 | 57.2 | 2 1/4 | 9150或9450 | 154.8 | 2.76:1 |
| NC46-65 | 165.1 | 6 1/2 | 71.4 | 2 13/16 | 9150或9450 | 154.8 | 3.05:1 |
| NC46-67 | 171.4 | 6 3/4 | 57.2 | 2 1/4 | 9150或9450 | 159.5 | 3.18:1 |
| NC50-67 | 171.4 | 6 3/4 | 71.4 | 2 13/16 | 9150或9450 | 159.5 | 2.37:1 |
| NC50-70 | 177.8 | 7 | 57.2 | 2 1/4 | 9150或9450 | 164.7 | 2.54:1 |
| NC50-70 | 177.8 | 7 | 71.4 | 2 13/16 | 9150或9450 | 164.7 | 2.73:1 |
| NC50-72 | 184.2 | 7 1/4 | 71.4 | 2 13/16 | 9150或9450 | 169.5 | 3.12:1 |
| NC56-77 | 196.8 | 7 3/4 | 71.4 | 2 13/16 | 9150或9450 | 185.3 | 2.70:1 |
| NC56-80 | 203.2 | 8 | 71.4 | 2 13/16 | 9150或9450 | 190.1 | 3.02:1 |
| 6 5/8REG | 209.6 | 8 1/4 | 71.4 | 2 13/16 | 9150或9450 | 195.7 | 2.93:1 |
| NC61-90 | 228.6 | 9 | 71.4 | 2 13/16 | 9150或9450 | 212.7 | 3.17:1 |
| 7 5/8REG | 241.3 | 9 1/2 | 76.2 | 3 | 9150或9450 | 223.8 | 2.81:1 |
| NC70-97 | 247.6 | 9 3/4 | 76.2 | 3 | 9150或9450 | 232.6 | 2.57:1 |
| NC70-100 | 254.0 | 10 | 76.2 | 3 | 9150或9450 | 237.3 | 2.81:1 |
| 8 5/8REG | 279.4 | 11 | 76.2 | 3 | 9150或9450 | 266.7 | 2.84:1 |
ENN is headquartered in Beijing, covering more than 60 countries worldwide. It has set up warehousing consignment centers in Houston and Dubai to provide trading, processing and distribution services to global energy companies.
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