FIELD: engines and pumps.
SUBSTANCE: invention relates to pump production, particularly to downhole multi-stage pumps intended for pumping edge water with high gas content. To reduce liberation of gas phase from pumped gas-fluid mix, outer surfaces of nozzle box housings 2 of two initial stages have channels 5 communicating space 6 between cover 3 and nozzle box housing 2 of one stage with space 7 between cover 3 and housing 2 of adjacent stage. Note here that inlet pressure of nozzle box of inferior stage increase with pressure difference at inlets of adjacent stages. The number of stages with their nozzle box outer surface having channels 5 is defined subject to the condition of creating pressure at first-stage nozzle box equal to or higher than saturation pressure.
EFFECT: higher reliability in pumping gas-fluid mix due to reduced extraction of gas phase (over 30%) from pumped mix.
2 cl, 2 dwg
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