| 出生地 |
Jiangsu China (Mainland) |
| 牌子的名字 |
chenlong |
| 类型 |
钻头领 |
| 机器型号 |
钻探工具 |
| 验证 |
研究所 |
| 材料 |
高锰铁 |
| 使用 |
钻井 |
Spiral drill collar is used to reduce contact area with hole so as to avoid efficiently bit sticking form differential pressure. Spiral drill collars are manufactured strictly according to the standard of API Spec7-1 and SY/T5144