Performance Differences of Electrical Submersible Pump under Variable Speed Schemes
H. L. Wang, Qiying Hu, Yongfei Yang, C. Wang
Abstract
Frequent shifts of electrical submersible pump (ESP) often lead to system vibration and noise, thereby reducing its operational stability. Three different speed change schemes were investigated to improve the stability of its variable speed process. The operational stability of ESP under different variable speed schemes was analysed. The transient numerical calculations of different variable speed schemes were conducted on ANSYS CFX to obtain the head fluctuation law. The stability of ESP with different head fluctuation laws was analysed, and the accuracy of numerical calculation was verified through tests. Result show that a high similarity is found between the head change curves and speed change curves with all methods. The head stability in uniform acceleration variable speed process and quadratic acceleration process with negative quadratic coefficient is high. The extreme value of head variation rate with the two variable speed processes is small, which is convenient for the stability of the variable speed operation of ESP. The research results serve as guide for improving the stability of the variable speed process of ESP.