A new hydraulic power assisted rodless oil pumping system

Such as side attrition of pumping rods and tubes problems often encountered when the conventional oil pumping unit is used for inclined wells production. To solve the technical problems, a new liquid power assisted rodless oil pumping system is developed based on hydraulic principle. The novel system can completely solve the rod-tube side attrition problem, and is especially applicable used in inclined wells. This system includes ground hydraulic driving system, power transmission system and down-hole hydraulic oil pumping system. Its workflow is introduced in this paper. In-site test has smoothly run over 18 months which indicates the system can fully meet the oil field production requirements.