电动机直驱抽油机的研制及试验

为提高抽油机系统效率,节约电能,满足油田新的开采需求,研制了电动机直驱抽油机。该抽油机将永磁同步电动机悬挂式安装,电动机输出轴与天轮总成轴通过花键联轴器直接连接,省去了减速器和换向机构;特殊胶带绕过天轮总成和导轮总成,一端连接悬挂器,另一端连接配重箱。永磁同步电动机在通入低频电流后,转子做低速正、反转运动,直接通过特殊胶带带动抽油杆做往复直线运动,举升井内液体。现场试验结果表明,电动机直驱抽油机启动电流小,冲程冲次无级可调,有助于提高泵效,比常规游梁式抽油机节电20%左右。

Development and Test of Electric Motor Direct Drive Pumping Unit

To improve the efficiency of pumping unit system,save electricity and meet the new needs of oilfields production,the electric motor direct drive pumping unit was developed.The unit conducts a hanging-type installment of the permanent magnet synchronous motor whose output shaft is directly connected with top sheave shaft by spline coupling,thus omitting gear reducer and reverse mechanism.The special belt goes around top sheave assembly and guide wheel assembly,with one end connected to the hanger and the other to the weight box.When low frequency electric current goes through the permanent magnet synchronous motor,the rotor conducts low-velocity direct/reverse rotating motion,directly drive the sucker rod move upward and downward to lift the liquid in the well.The field test shows that the startup current of the pumping unit is small,its stroke and pumping speed is adjustable and the polished rod moves regularly,which helps improve pump efficiency.Compared with conventional beam pumping unit,it can save electricity by 20%.