of drilling meaning in English

混合钻进方法

After months of drilling , oil was found off the coast .
经数月钻探，在沿海找到了石油。
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。
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。
Study on theory of drill rod with new type structure
一种新型结构钎杆的理论研究
Stability analysis of drill - string in directional drilling
定向井钻柱稳定性分析

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