Square kelly
The kelly rod is located at the uppermost end of the drill string, transmits torque and bears the weight of the drill string, and is the driving part of the entire drill string. The square drill pipe implements the API Spec7-1 specification, the rod body material is 4145H, after the overall heat treatment, the thread is hardened and then phosphated, and the anti-sticking performance is good. According to customer requirements, 114.3×114.3 and 170×170 square drill pipes can be produced.
| Specification of square drill pipe | Drive length (m) |
full length (mm) |
Internal thread connection | Male thread connection | ||||
|---|---|---|---|---|---|---|---|---|
| mm | in | Left-handed specifications | Outer diameter (mm) |
specification | Outer diameter (mm) |
the inside diameter of (mm) |
||
| 63.5 | 3 | 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | NC26 | 85.7 | 31.8 |
| 76.2 | 3 | 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | NC31 | 104.8 | 44.4 |
| 88.9 | 31/2 | 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | NC38 | 120.6 | 57.2 |
| 108 | 41/4 | 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | NC46 | 158.8 | 71.4 |
| 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | NC50 | 161.9 | 71.4 | ||
| 133.4 | 51/4 | 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | NC56 | 177.8 | 82.6 |
| 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | 51/2FH | 177.8 | 82.6 | ||
| Specification of hexagonal drill pipe | Drive length (m) |
full length (mm) |
Internal thread connection | Male thread connection | ||||
|---|---|---|---|---|---|---|---|---|
| mm | in | Left-handed specifications | Outer diameter (mm) |
specification | Outer diameter (mm) |
the inside diameter of (mm) |
||
| 76.2 | 3 | 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | NC26 | 85.7 | 31.8 |
| 88.9 | 31/2 | 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | NC31 | 104.8 | 44.4 |
| 108 | 41/4 | 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | NC38 | 120.6 | 57.2 |
| 133.4 | 51/4 | 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | NC46 | 158.8 | 76.2 |
| 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | NC50 | 161.9 | 82.6 | ||
| 152.4 | 6 | 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | 51/2FH | 177.8 | 88.9 |
| 11.28 | 12.19 | 6 5/8REG-LH | 196.8 | NC56 | 177.8 | 88.9 | ||