| 1. | After months of drilling , oil was found off the coast .
经数月钻探，在沿海找到了石油。 |
| 2. | The same principle was used in a method of drilling in oilfields .
油田的钻探方法采用了同样的原理。 |
| 3. | Remarkable progress had been made in the technique of drilling wells long before the earliest oil-wells .
远在最早的油井之前，钻井技术就已经取得了显著的进步。 |
| 4. | Study on theory of drill rod with new type structure
一种新型结构钎杆的理论研究 |
| 5. | Stability analysis of drill - string in directional drilling
定向井钻柱稳定性分析 |
| 6. | Diameters of drills for minor diameters of tapped threads
攻螺纹内径用钻头直经 |
| 7. | Hydraulic driving system of drilling reciprocating pump
钻井往复泵液压驱动系统 |
| 8. | Verification regulation of density meters of drilling fluids
钻井液密度计检定规程 |
| 9. | Discussion of drilling depth of seeing coal error rule
钻探见煤深度误差规律的探讨 |
