WELL SUCKER-ROD PUMP WITH DOUBLE-ACTING PUMP Russian patent published in 2017 - IPC E21B43/14 E21B34/06 F04B47/02 

FIELD: oil industry.

SUBSTANCE: invention relates to oil producing industry and can be used in operation of flooded wells. Installation includes a piston, a cylinder with a lower pressure valve, a lower inlet with a suction valve and upper inlet openings located above packer and, consequently, above and below piston. Piston is configured for back-and-forth movement. Movement of piston downwards is limited by an inner ledge. There is a pipe string, on which a rod pump is lowered into well. Its outlet through pipe string is communicated with well head, and through lower injection valve - with under-packer space. In upper part of cylinder of rod pump there is a bottomhole-pressure valve configured for back and forth movement. It is rigidly coupled with stem by means of rod pump. Its length is equal to or greater than length of pump stroke. In upper part of cylinder bottom-hole pump there is a retaining valve. It comprises a body with a seat and movable sleeve-valve, placed in cavity of valve body. Pump rod passes through inner cavity of sleeve-valve to seal gap between pump rod and internal cavity of sleeve-valve. Lower part of sleeve-valve tightly interacts with a seat located in lower part of retaining valve body, during stroke of stem with pump rod down. Installation is designed for a well with casing string, two exposed formations and packer located between opened formations.

EFFECT: technical result is improvement of operational reliability, providing higher efficiency of installation during extraction of well product with high gas factor and higher productive capacity due to simplification of pump.

1 cl, 3 dwg