The test method of pressure loss,flow loss and frictional force loss etc.of the hydraulic pumping units is presented,from which the mechanical efficiency and volumetric efficiency are obtained.

• 给出了测取液压抽油机系统压力损失、流量损失以及油缸的摩擦力损失等的方法,并由此求出系统的机械效率与容积效率。