compressed air drill
... 压缩气疗法 aeropiesotherapy 压缩气钻 compressed air drill 压缩气喷嘴 airgun ...
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压缩空气钻探 air drilling
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气体不仅密度低，而且具有很大的可压缩性，所以空气钻井的体积流量将随压力和温度变化，而压力和温度又随井深变化。
Air has a low density and great compressibility. The volumetric flow rate of air in air drilling varies with pressure and temperature, which in turn, change with WLL depth.
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