FIELD: pump building.
SUBSTANCE: invention relates to submersible downhole pumping units and can be used for extraction of oil, water and other fluids from wells. Downhole pumping unit comprises a radial-plunger pump including a shaft with a through axial channel and radial holes, inlet and outlet valves, and an electric motor with hydraulic protection. Through axial channel of the shaft of the radial-plunger pump is equipped with an elastic diaphragm for supply of well fluid from the inlet valve to the outlet valve due to cyclic compression of the elastic diaphragm by plungers.
EFFECT: invention is aimed at improvement of reliability and energy efficiency of downhole pumping units.
3 cl, 7 dwg
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