CAJ | 학술논문

为了认清螺杆泵的漏失机理，还原其井下实际生产条件下的工作状况，根据流体传压特性，将螺杆泵漏失细分为泵内滑失和泵外漏失。在确定泵内压力分布的基础上计算了螺杆泵各腔室的滑失速度，研究了不同泵吸入口空隙率和排出口压力下的漏失规律。结果表明：泵内压力变化导致泵内流体滑失，滑失又会影响泵内压力分布，泵外漏失是泵内滑失达到一定程度时出现的现象；气相存在一个较小的滑失区间，随着泵排出口压力增加，滑失区间向吸入口偏移；泵吸入口空隙率的增加改变了泵内流体的可压缩性，使得液相滑失速度曲线由线性进化为抛物线型，气相滑失区间向排出口扩散。研究结果为螺杆泵漏失量的计算提供了依据。
위료인청라간빙적루실궤리，환원기정하실제생산조건하적공작상황，근거류체전압특성，장라간빙루실세분위빙내활실화빙외루실。재학정빙내압력분포적기출상계산료라간빙각강실적활실속도，연구료불동빙흡입구공극솔화배출구압력하적루실규률。결과표명：빙내압력변화도치빙내류체활실，활실우회영향빙내압력분포，빙외루실시빙내활실체도일정정도시출현적현상；기상존재일개교소적활실구간，수착빙배출구압력증가，활실구간향흡입구편이；빙흡입구공극솔적증가개변료빙내류체적가압축성，사득액상활실속도곡선유선성진화위포물선형，기상활실구간향배출구확산。연구결과위라간빙루실량적계산제공료의거。
In order to understand the mechanism of progressive cavity pump dropout, recreate its working status under actual production conditions underground, the pump dropout was subdivided into“internal slippage”and“external dropout”according to the pressure transmission characteristics of lfuid. Slip velocity of each cavity in progressive cavity pump was calculated based on determin-ing pump internal pressure distribution, and then the changing law of pump dropout under different suction inlet gas void ratio and outlet pressure conditions. Results show that:the change of pump inner pressure leads to lfuid slippage in pump, which affects pump internal pressure distribution conversely;when“internal slippage”reaches to a certain level, it transforms into“external dropout”;There is a rela-tive smaller“slippage region”for gaseous phase, and with the ascension of outlet pressure, the“slippage region”offsets to suction inlet;The increase of suction inlet void ratio changes the condensability lfuid in pump, resulting in liquid phase slip velocity curve evolves into parabolic type from linear, and gaseous phase“slippage region”spreads to outlet. This method offers basis for determining leakage of progressive cavity pump.