FIELD: oil-and-gas production.
SUBSTANCE: devise designed for oil-and-gas production during separate production of water and oil without water withdrawal to the surface, on fields with high oil viscosity. Device consists of fixed stepped cylinder with installed in it differential piston, including suction and injection valves, free piston, low pressure lift system for water supply into cylinder and high pressure lift for pumping water into reservoir, parker and additional chamber with suction and injection valves and sealing element, providing lower cylinder and two-row lift and parker system hydraulic connection. Device equipped with additional parker, dividing oil saturated reservoir layers from water saturated ones. The cylinder executed as a three-stepped, which bottom step has a bigger diametre than middle one, but smaller than its upper step.
EFFECT: reservoir oil recovery increase, cast and power consumption cutting.
4 dwg
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