连续排液型柱塞结构优化设计与实验研究

Optimal design and experimental research on structure of continuous drainage plunger

针对常规柱塞排水工艺排液效率低、工艺成本高的问题,设计了连续排水型柱塞。柱塞本体与密封钢球井底吸合组成密封柱塞上行举液,到达井口时柱塞本体与密封钢球分离,分别下落,提高了下落速度,可实现不关井连续排液。利用数值模拟计算与室内实验相结合的方式,对连续排水型柱塞内部、外部结构进行了优化设计,优化后排液密封效果良好,柱塞本体与密封钢球顺利分离后,快速下落,未出现提前吸合的现象。相较于常规柱塞系统,连续排水型柱塞不需要开关井控制器和地面控制系统,降低工艺成本30%。连续排水型柱塞为提高排液效率、降低油田开发成本提供了有效手段。

In order to solve the problems of low drainage efficiency and high cost of conventional plunger drainage technology,the continuous drainage plunger was designed.The plunger body and the sealing steel ball are sucked together at the bottom of the well to form a sealing plunger that lifts the liquid when it moves up,and when the sealing plunger reaches the wellhead,the plunger body separates from the sealing steel ball and they fall respectively.The falling speed is increased,and continuous liquid drainage can be realized without shutting in the well.Combined numerical simulation calculation with indoor experiment,the internal and external structure of the continuous drainage plunger was optimized and the drainage sealing effect was good after optimization.After plunger body and the sealing steel ball are separated smoothly from each other and they fall quickly with no suck-in phenomenon in advance.Compared with the conventional plunger system,the continuous drainage plunger does not require the well opening&well closing controller and the surface control system,which reduces the operating cost by 30%.The continuous drainage plunger has provided an effective means to improve the efficiency of drainage and reduce the development cost in the oilfield.