FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil and gas industry and is intended for wells operated by electric centrifugal pumps (EDCPU) in sloping sections of production strings. Pump-and-ejector unit comprises a check valve shutoff assembly at the inlet of the low-pressure flow from the annular space into the pumping-ejector unit. Shutoff assembly is equipped with return spring to ensure operability of check valve and entire set of downhole equipment EDCPU in sloping sections of production wells.
EFFECT: enabling operation of electric centrifugal pumps in wells with inclined directed sections of production strings with deviation from vertical of more than 40 and 90 degrees (zenith angle) under conditions of pressure drop at EDCPU reception below saturation pressure with high and ultrahigh gas factor.
1 cl, 2 dwg
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