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.當流體壓力降到蒸汽壓力以下，則出現(xiàn)氣蝕現(xiàn)象。如果一部分敞開的腔室被流體的蒸汽所充滿，當腔室封閉、轉子施加正壓力后，蒸汽則凝析，螺桿泵定轉子，會使泵出現(xiàn)脈動和噪音。因此，為使泵能達到其理論排量和正常運轉，要求流體壓力大于其蒸汽壓力，并且吸入壓降小于
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