DOWNHOLE WATER PUMPING METHOD FOR OIL FORMATION FLOODING PURPOSES Russian patent published in 2019 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used in water flooding of oil formations with application of downhole water pumping. Method includes selection of injection well opening oil-bearing formation, perforation of water-bearing formation, in which current formation pressure exceeds reservoir pressure of oil-bearing formation, and the water-bearing formation itself is located above or below relative to the perforated oil-bearing formation, pumping water from the water-bearing formation into the oil-bearing formation. According to the invention, in the wellbore between the water-bearing and oil-bearing formations, system A, which is a pipe is lowered on the perforated tubing string, in which in sequence from water-bearing bed to oil-bearing there connected is electric power rotor-generator, accumulator, electric motor drive and electric-centrifugal pump, wherein between system A and production string opposite to rotor-generator packer is installed so that water flow passes through system A, inside the perforated tubing string a cable is placed, water flow rate for pumping into the oil formation is controlled from the surface through the cable by changing the electric motor operating modes, which is powered by electric power accumulated in accumulator from rotor-generator due to water flow.

EFFECT: technical result consists in improvement of efficiency of downhole water pumping.

1 cl, 1 dwg