DOWNHOLE DEEP PUMPING UNIT Russian patent published in 2023 - IPC E21B43/00 F04B47/02 

FIELD: oil and gas industry.

SUBSTANCE: invention relates namely to the devices for lifting well fluid to the surface from a well with a complex profile. A downhole deep-well pumping installation includes a housing with spring centralizers on the outside and a working body inside, driven by supplied energy from the wellhead. The body is made in the form of a cylinder with a suction valve, and the working element is in the form of a plunger with a discharge valve. The energy transmitting plunger for reciprocating movement is connected by rods to the wellhead drive. The cylinder is additionally equipped with rigid centralizers at the top and bottom. Spring centralizers are installed outside the cylinder between rigid centralizers evenly along the length, at least one per 1 m of the cylinder, to prevent its interaction with the walls of the well.

EFFECT: it is ensured that the plunger does not jam inside the cylinder when working in a well with a complex profile by installing rigid centralizers along the edges of the cylinder, and spring centralizers evenly along its length.

1 cl, 1 dwg