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.
2
气体钻井技术作为我国当前及未来的石油钻探主力技术，气动冲击器是其能否实现有效钻进的关键设备之一。
Gas drilling technology as our current and future main oil drilling technology, pneumatic pneumatic is one of key equipments of it to determine achieved effective drilling.
3
穿孔过程中自身不回转的非开挖气动锤包括冲击矛、夯管锤和爆管锤。
The trenchless pneumatic hammers which don t rotate themselves during drilling include impact moles, pipe ramming hammers and pipe bursting hammers.
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