DEVICE FOR OIL PRODUCTION Russian patent published in 2014 - IPC E21B43/12 

FIELD: oil and gas industry.

SUBSTANCE: device includes housing, electric motor, submersible pump with discharge end and intake device and ejector. According to invention device is equipped with housing that forms annular channel with the housing downwards discharge end and upwards ejector. Ejector is located in intake device and made as annular slot. At that ejector inlet nozzle is connected to discharge end of submersible pump through annular channel for the purpose of partial return of pumped oil. At ejector output, before the first pumping step, there is a mixing chamber providing possibility of gaseous phase dispersion and pressure increase.

EFFECT: possibility of increasing pump efficiency during operation with gas-containing mixture at increase of permitted gas content in mixture at the pump intake; possibility of periodical pumping-out of gas accumulated at small and even zero quantity of liquid phase.

3 cl, 2 dwg