潜油电动机启动过程对油管的振动影响分析

潜油电动机启动过程会引起举升油管的扭转振动。建立了电潜泵和油管柱组合系统较精确的振动模型,通过构建潜油电动机启动过程的仿真模型,得出不同工况下举升油管的运动规律。实例仿真结果表明,潜油电动机启动时冲击电流会达到稳态电流的20倍左右;同时表明,潜油电动机启动过程中,油管的转角始终处于上升阶段,当电动机稳态运行时,油管转角先处于上升阶段,然后做类似正弦波的周期运动,且在每一个振动周期中转角的最小值为一定值。

Analysis on the influence of submersible electric motor starting on tubing vibration

Torsional vibration for the lifting tubings would be caused during the submersible electric motor starting. A more accurate vibration model is established for the assembly of electricsubmersible pump (ESP) and tubing string, motion laws for lifting tubings on different working conditions are obtained by establishing a simulation model for the starting process of the submersible electric motor. Example simulation result shows that impulse current induced in the process of the motor starting is as high as about 20 times of steady current, and it also shows that during the motor starting, the rotation angle of the tubing is always in lifting status, when the motor is in steady operation, its rotation angle is first in lifting status, and then it conducts in similar sine and cyclical movement and the least value of the rotation angle is a constant one in each vibration cycle.