关键词:  , 直连式液压抽油机；设计；应用

Abstract:  During the mid-late period of high water cut oil field development, long stroke and low speed pumping units are needed to improve the liquid and oil production. In this paper, groups of 2 or more hydraulic pumping units directly connected and driven by one hydraulic station are introduced. With U-tube balanced counterweight energy-saving principle, the units can reverse smoothly, save energy, reduce consumption, and greatly improve the life of the hydraulic pumping units, so as to reduce costs, increase production and efficiency. As of December 2016, it has been successively pilot tested in 55 shallow, middle and deep wells in Jilin oilfield. The one station 2 well ydraulic pumping units have been trouble-free run for more than 1500 days, pump efficiency increased by 35% . Its integral stability and adaptability to extremely cold environment have been field proved.

Key words:  , directly connected hydraulic pumping unit,design, application