OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2015 - IPC E21B43/20 E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: according to the method downhole water pumping is performed from the underlying water-bearing formation to the overlying producing formation through the injecting well. The underlying water-flooded formation is selected so that is has temperature less than temperature of the overlying producing formation. The wells are placed at the selected section of the deposit by cluster method. Injecting well stock is divided into passive wells for formation pressure maintenance in the overlaying producing formation due to capillary displacement and active wells. Quantity of the latter is twice less than quantity of passive wells. Active wells are intended for water injection to the underlying water-flooded formation. In the passive injecting well the underlying water-flooded formation and overlying producing formation are perforated. In the active injecting well the underlying water-flooded formation is perforated. Through the active injecting well water is pumped into the underlying water-flooded formation. Pressure drop in the underlying water-flooded formation stipulates movement of brine water towards the passive injecting well with perforated underlying and overlying formations. At that formation pressure is maintained in the underlying water-flooded formation. Due to pressure drop in the overlying producing formation the formation fluid is moved towards the producing well. Formation fluid is extracted from the producing formation through the producing well.

EFFECT: improved efficiency of oil deposits development, reduced power costs.

10 cl, 1 dwg