METHOD OF OPERATING FLOODED WELLS AND SYSTEM THEREFOR Russian patent published in 2016 - IPC E21B43/14 E21B43/38 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry and can be used in operation of water-flooded oil wells at late stage of operating oil deposit. Method comprises selecting a well based on water content and presence of underlying formation. Selected well is stopped. Tubing string is lowered into well. Packer is installed between water-flooded and underlying formations. Two screw pumps are successively lowered. Lower screw pump is lowered below water-flooded formation. Upper screw pump is lowered to upper part of tubing string. By means of lower screw pump well fluid is pumped into underlying formation from water-flooded formation. Oil in water-flooded formation is displaced into upper part due to provision of required speed of pumping borehole fluid. Oil film rising onto surface is pumped withy upper screw pump. Screw pump is operated at rated frequency of 1,500 rpm. Operation of each screw pump is controlled by separate control station with frequency converter.

EFFECT: technical result is higher efficiency of operation of oil wells with high water cut.

22 cl, 1 dwg