采用回转或冲击回转钻进方法，钻进效率高。
Using with rotation drilling and percussion -rotation drilling, drill efficiently.
近年来，冶金地质系统的冲击回转钻进技术取得了较好的效果。
In recent years, percussion rotation drilling technique in geological departments of Ministry of Metalurgical Industry has gained a reapid development.
气动冲击回转钻进主要应用于难用或忌用液体作为循环介质的地区。
The pneumatic percussion rotary drilling is mainly operated in the area where liquid is hardly or not permitted to be used as the circular medium.
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