ELECTRIC HYDROSTATIC WELL PUMP AGGREGATE FOR OIL PRODUCTION Russian patent published in 2015 - IPC F04B47/08 

FIELD: oil and gas industry.

SUBSTANCE: submersion pump aggregate is a sealed capsule where submersion motor with connected drive pump are placed. The aggregate features hydraulic motor with its main rod connected to the rod of operation pump located outside the sealed capsule and equipped with suction and pressure valve in the case top and bottom covers, respectively. Distributor is controlled mechanically by a cam mounted on a dummy rod of hydraulic motor and having the same diameter with the main rod, and used to supply high-pressure work fluid to the main rod cavity of the hydraulic motor. Check valve is installed in the operation pump stem to combine process and to ensure equal rate of oil suction and injection from reservoir. By safety bypass valve installed in HP line of dummy rod cavity of the hydraulic motor, the rate is reduced automatically when reservoir pressure drops. Bypass pressure is regulated by throttle equal to safety valve adjustment pressure with account of pump unit installation depth in the well and a value required to override vacuum evolving in the rod cavity of operation pump in the absence of reservoir pressure at that depth.

EFFECT: enhanced suction rate with changing reservoir pressure.

1 dwg