FIELD: lifting liquids from oil wells. SUBSTANCE: pumping unit includes cylinder with lower suction valve located in lower portion coaxially relative to cylinder. Center suction valve is located above lower one eccentrically relative to axis of cylinder. Upper suction valve is located above, coaxially relative to center suction valve. Low-pressure intake chamber is located at inlet of lower suction valve; its upper portion is connected with center suction valve by means of connecting pipe. Pumping unit is provided with additional high-pressure intake chamber located below low-pressure intake chamber and connected with it by means of lifting pipes. Upper portion of high-pressure intake chamber is connected with well through outlet valve. EFFECT: enhanced efficiency of operation of oil wells at high gas-oil factor and low dynamic level where existing pumping units operate at low efficiency. 1 dwg
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