hard-rock drilling

常见例句

The revolving-drilling technique is one of the new-type and effective methods for hard rock drilling.
旋冲钻井技术被认为是解决深井硬地层钻井难题的最有效方法之一，具有良好的应用前景。
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.
本文回顾了我国自推广金刚石钻进技术以来，金刚石钻头在坚硬致密弱研磨性岩层中钻进研究进展。
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.
旋冲钻井技术近年来已成为石油钻井界广泛关注的热点研究课题，被认为是解决深井硬地层钻进难题的最有效方法之一，具有良好的应用前景。