抽油杆泵筒内流体压力变化规律

了解抽油泵筒内压力变化规律,有助于认识抽油泵在井下的工作状态,同时也有助于分析和计算抽油杆柱底部受力。利用井下抽油杆柱力学检测装置对抽油泵筒内的压力及其变化进行了实测。结果表明,抽油泵筒内的流体压力呈规律性变化。分析认为,抽油泵筒内的流体压力在上下冲程中的构成是不同的,下冲程的压力大于上冲程;下冲程固定阀完全关闭时泵筒内的流体压力达到最大值,上冲程游动阀完全关闭时泵筒内的流体压力达到最小值;泵阀的漏失对泵筒内的流体压力有一定的影响。分析还表明,在井筒内的流体阻力占有相当大的比例。

Study on the variation regularity of fluid pressure in a pump barrel

It is important for petroleum production engineer to know pressure variation regularity of a sucker rod pump, which could help analyze the dynamics of the rod at the bottom and apprehend the working condition of the pump. The fluid pressure in the pump barrel was measured by a dynamics rod detecting instrument. The study showed that the fluid pressure in the pump barrel was varied periodically. The fluid pressure in the pump barrel was for different stroke, where the pressure in the lower stroke was larger than that of upper stroke. The study also showed that the pressure in the pump barrel was affected by the leakage of the valves, and the fluid flow resistance between rod and tubing was very large.