rotary percussion drilling

Living things throve in Devonian strata of the nappe, and their species were numerous. APPLICATION OF ROTARY PERCUSSION DRILLING TECHNOLOGY IN REVERSE THRUST NAPPE STRUCTURE FORMATION

旋冲钻井技术在逆掩推覆体地层的应用

Jamming often takes place during percussion rotary drilling.

用冲击回转式凿岩机凿岩时卡钎是经常发生的.

The new development of percussion-rotary drilling technique

冲击旋转钻进技术新发展

The research of percussion and rotary drilling technique of geothermic well

地热井射流式冲击器冲击回转钻进的分流试验研究

According to the field applications of jet type hydraulic percussion tools, the main problems which affect the development rotary percussion drilling technology are put forward. At last several opinions are concluded about how to improve the efficiency of rotary percussive drilling tools.

并根据射流式液动冲击器现场试验应用，阐述了影响冲击旋转钻进技术发展的的主要问题，提出了提高冲击旋转钻井工具应用效果的几点看法。