Variable speed drive optimization model and analysis of comprehensive performance of beam pumping unit

Abstract

The beam pumping unit has the characteristics of simple structure, reliability and durability. It is the most widely used artificial lifting method in oil fields worldwide. However, the inherent defects of the 4-bar linkage structure of the beam pumping unit result in high impact, low system efficiency and large motor rated power. In order to improve the efficiency of the pumping unit system and make full use of the inertial load of the moving parts, we established the dynamic model and optimization method of the variable speed drive pumping unit. This paper uses theoretical analysis, programming calculation and experimental research to complete the optimization calculation of variable speed of beam pumping unit, the calculation results show that the appropriate variable speed operation scheme can improve the system efficiency and power saving rate, reduce the motor power peak and torque peak, and reduce the crankcase torque peak and the suspension point load peak. Application results in oilfields show that the variable speed optimization technology can improve the comprehensive performance of the pumping well system, increase production, reduce energy consumption and improve safety.