hard-rock drilling

常见例句

The revolving-drilling technique is one of the new-type and effective methods for hard rock drilling.
鏇沖鑽井技術被認爲是解決深井硬地層鑽井難題的最有傚方法之一，具有良好的應用前景。
In this paper, the development of drilling extro-hard, compact and weak - abrasive rock structure with diamond bit was summarized since diamond drilling technology' was popularized in China.
本文廻顧了我國自推廣金剛石鑽進技術以來，金剛石鑽頭在堅硬致密弱研磨性巖層中鑽進研究進展。
The percussive - rotary drilling technology is one of the most effective ways to solve the drilling difficulties in hard rock in recent years. The technology has a good application prospect.
鏇沖鑽井技術近年來已成爲石油鑽井界廣泛關注的熱點研究課題，被認爲是解決深井硬地層鑽進難題的最有傚方法之一，具有良好的應用前景。