DOWHOLE PUMPING ASSEMBLY AND A DOWNHOLE SYSTEM Russian patent published in 2018 - IPC E21B43/12 F04B47/08 F04B9/105 

FIELD: soil or rock drilling; mining.

SUBSTANCE: present invention relates to a downhole pump assembly for inserting into the wellbore inside the casing and submerging into the fluid of the well, the well pump assembly being extended longitudinally and configured to be connected to the cable. Downhole pump assembly includes a pump section including a tubular pump housing providing a pumping chamber, an inlet provided in the tubular pump housing, the inlet port being fluidly communicable with the pumping chamber, the first valve being a check valve for opening and closing the inlet for allowing the fluid to flow into the chamber, a plunger slidably disposed in the pump chamber, a pump rod operatively connected to the plunger and extending from the plunger through the tubular pump body, an outlet opening formed in the tubular pump body, the outlet port being fluidly communicable with the pump chamber, a second valve being a check valve for controlling the flow of fluid leaving the chamber through the outlet. Downhole pump assembly further comprises a linear actuator coupled to the tubular pump body and configured to actuate the pump rod, wherein when the downhole pump assembly is at least partially submerged in the wellbore fluid, it is possible to draw the well fluid into the tubular pump housing through the inlet and expel it through an outlet in the tubular pump housing, the pumping section further comprising at least one sealing element for isolating the first portion of the casing from the second portion of the casing.

EFFECT: technical result is to increase the efficiency of the downhole pump assembly.

15 cl, 14 dwg