OIL-WELL SUCKER-ROD PUMPING UNIT FOR WATER PUMPING TO STRATUM Russian patent published in 2013 - IPC E21B43/20 F04B47/02 

FIELD: oil and gas industry.

SUBSTANCE: oil-well sucker-rod pumping unit for water pumping to stratum includes packer installed upwards stratum, tubing string with pressure control valves and suction valves. Plunger pump with cylinder run-in at tubing-string is installed upwards valves. Suction valve is connected to space over the packer. Rod stripper is equipped with lubrication tank. Tubular annulus of the well is connected to water supply pipeline. Plunger is equipped additionally with device for forced downstroke. Downwards pressure control valve there's an auxiliary pressure control valve connected to space below the packer and output of this valve is done through isolating device. Device for forced downstroke of the piston can be made as loads or pneumatic accumulator connected to piston. Working cavity of pneumatic accumulator is the upper part of tubing string. Technical results provides expanding of application scope of the unit in injection wells with pumping under high pressure, improving operation reliability due to improving operation reliability of suction and pressure control valves.

EFFECT: improving operational efficiency of the well due to reduction of its repair period.

1 cl, 2 dwg