对混合杆柱抽油泵柱塞的超行程的讨论

Determination of Pumping Unit Efficiency and Motor Volume

分析讨论了国内一些学者解等直杆波动方程后把等直杆不同长度抽油杆柱的固有频率认为是多级 抽油杆柱的固有频率的错误概念,指出柱塞的惯性超行程形成是有条件的,不是“任何抽油杆柱在理论 上都可能产生超行程,只是大小不同而已”。惯性超行程是与冲次平方呈正比增长,但增加冲次对于抽油 整体特性来说产生了较多的负面影响,试图用增加冲次的方式来增加柱塞的有效冲程是不足取的。

The problem of counterbalance in beam pumping unit under alternating loading of upstroke and downstroke for sucker-rod pumping is studied in detail this paper. It is pointed out that some scholar s research results have mistakes on the transmission mechanism efficiency of the beam pumping unit and determining power demand of electric motor. The correct calculation formula for electric motor efficiency and the method of electric motor power are presented in the pa- per.