The measurement of volumetric flow rate will be errors when the parameters of the temperature and pressure change unceasingly.
流体的体积流量受温度、压力等参数的影响，在参数不断变化的情况下，会带来较大的测量误差。
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.
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。
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