DOWNHOLE PUMP UNIT Russian patent published in 2013 - IPC F04B47/06 E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: plant is designed for being used in oil industry for oil extraction with well pumps at simultaneous separate operation of two formations of one well. The plant for simultaneous separate operation of two formations in the well includes tubing strings and plunger pumps, suction and delivery valves, which are located in the casing. A linear electric motor is installed between pumps. The plant is equipped with a packer. An annular space is formed between the casing and the linear electric motor. Combined assemblies, the upper one of which includes built-in valves, are installed in upper and lower parts of the casing. It also includes a process hole for direction of an uprising flow of downhole fluid of under-packer zone from annular space to tubing string and a cable entry installation hole. Lower assembly is tightly connected to the casing and to the tubing.

EFFECT: simpler design, higher reliability and provision of separation of downhole fluid flows in under-packer and above-packer zones.

2 cl, 1 dwg