Experimental Study on Gas-Liquid Performance and Prediction of Shaft Power and Efficiency by Dimensionless Coefficients in a Multistage Electrical Submersible Pump

被引:5
作者
Chang, Liang [1 ]
Xu, Qiang [1 ]
Yang, Chenyu [1 ]
Su, Xiaobin [1 ]
Dai, Xiaoyu [1 ]
Guo, Liejin [1 ]
机构
[1] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, 28 West Xianning Rd, Xian 710049, Shaanxi, Peoples R China
来源
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME | 2023年 / 145卷 / 07期
基金
中国国家自然科学基金;
关键词
electrical submersible pump; gas-liquid two-phase flow; hydraulic performance; dimensionless coefficient; performance prediction; CENTRIFUGAL PUMP; 2-PHASE FLOW; ENTRAINED AIR; PATTERNS; MODEL;
D O I
10.1115/1.4062087
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Electrical submersible pumps (ESPs) widely used in oil-gas artificial lift consume a lot of electric energy in long-term operation. This paper mainly focuses on the gas-liquid performance and predicting shaft power and efficiency of a 25-stage ESP. First, the calculation methods of two-phase hydraulic parameters and corresponding dimensionless hydraulic coefficients based on isothermal compression are proposed. Ignoring the gas compressibility will result in large errors in calculating two-phase hydraulic parameters. Then, the effects of liquid flowrate, inlet gas volume fraction, and rotational speed on head, shaft power, and efficiency are analyzed. The severe two-phase head degradation disappears in downstream stages of the ESP because of the decreasing interstage gas volume fraction. Similar to the head, the shaft power and efficiency decrease slowly at first, then rapidly, and finally slowly with the increase of inlet gas volume fraction. Finally, correlations are proposed for predicting the shaft power and efficiency by the dimensionless head and flow coefficients. There is a power function relation between two-phase head coefficient and efficiency. Thus, through the pump head which can be easily acquired by differential pressure signals in pipeline, prediction correlations for shaft power and efficiency are established with the relative errors lower than 10%. The prediction method based on two-phase dimensionless coefficients can also be referenced to ESPs with different types.
引用
收藏
页数:17
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