FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil submersible equipment, namely to submersible pumping units, lowered on a carrying cable into wells complicated by a high gas factor, including into a tubing string (tubing) with a small bore. The unit contains an oil-filled submersible electric motor, a hydraulic protection, a discharge module, an electric centrifugal pump and a shank, around which a sealing unit is located. A multiphase pump is additionally installed between the electric centrifugal pump and the shank, with at the inlet axial stages mounted on the end of the shaft with a nominal flow exceeding that of the electric centrifugal pump. The axial inlet of the multiphase pump is not blocked by the shaft.
EFFECT: invention is aimed at ensuring reliable operation and increasing the wear resistance of a submersible unit on a carrying cable under conditions of an increased content of free gas at the inlet.
4 cl, 5 dwg
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