if you ignore the steam pressure， fluid dynamic friction loss&wellbore liquid pump suction， open an open chamber the maximum production pressure difference is 0.1mpa， as long as the pressure drop between the inlet&the chamber to form a chamber is less than the pressure difference， the wellbore fluid will be filled with the chamber， then screw pump can achieve the displacement perturbation theory.当流体压力降到蒸汽压力以下，则出现气蚀现象。如果一部分敞开的腔室被流体的蒸汽所充满，当腔室封闭、转子施加正压力后，螺杆泵转子，蒸汽则凝析，会使泵出现脉动和噪音。因此，为使泵能达到其理论排量和正常运转，要求流体压力大于其蒸汽压力，并且吸入压降小于
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