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针对大庆油田杏北开发区部分抽油机井机井能耗高、系统效率低等问题,试验应用异步电动机矢量控制装置,以降低抽油机井能耗,提高系统效率。矢量控制技术是通过理论算法将定子电流等效为励磁电流和转矩电流,使异步电机具有和直流电机相似的性能。该技术克服了普通变频器低速负载性差的不足,具有低速大转矩特征,实现了抽油机井软启动、负载跟踪、功率自动匹配和抽油杆运行轨迹优化。将矢量控制技术应用于不同产液、不同供液状况的抽油机井。现场应用结果表明:5口试验井均达到了节电、提效的目标,平均单井功率因数提高0.47,吨液百米节电率达19.5%,泵效提高4.1个百分点,系统效率提高6.7%;供液不足的井泵效大幅提高,低系统效率井系统效率明显提高。异步电机矢量控制技术的应用,为高含水后期油田的高效举升提供了技术支撑。
Aiming at the problems of high energy consumption and low system efficiency of some pumping wells in the Xingbei Development Zone of Daqing Oilfield, the induction motor vector control device is applied to reduce the energy consumption of the pumping wells and improve the system efficiency. Vector control technology is the theoretical algorithm of the stator current equivalent excitation current and torque current, the induction motor with DC and similar performance. The technology overcomes the shortcomings of low speed load, such as low speed and large torque, and realizes the soft start, load tracking, power automatic matching and the optimization of sucker rod running trajectory. The vector control technology is applied to different liquid production, pumping conditions for different pumping wells. The field application results show that the five pilot wells all achieved the goal of saving electricity and improving efficiency. The average single-well power factor increased by 0.47, the power saving rate of 100 meters per ton of liquid reached 19.5%, the pump efficiency increased by 4.1% and the system efficiency increased by 6.7% ; Insufficient pumping well pump efficiency increased significantly, low system efficiency well system efficiency improved significantly. The application of asynchronous motor vector control technology provides technical support for the efficient lifting of oilfields with high water cut.