percussion rotary drilling 冲击回转钻进
percussion-rotary drilling technique 冲击旋转钻进技术
percussion rotary drilling technology 冲击旋转钻井技术
rotary percussion drilling 旋转冲唤钻进 ; 旋转冲击钻井
The percussion-rotary drilling technique is one of the most effective drilling methods. It has made a great progress in recent years.
冲击旋转钻进技术是一种高效的碎岩方法，近年来随着施工领域的拓宽取得了很大的进步。
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.
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 rotary percussion drilling technology have the advantage to raise the hard rock well drilling speed effectively, prevent the borehole deviation in the hard rock or the complicated geologic strata.
旋转冲击钻井技术依靠冲击器产生冲击载荷并作用在钻头上来破碎岩石。该技术能够有效提高硬地层钻井速度，能够防止硬地层及复杂地层钻井中的井斜问题。
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