OPERATING METHOD OF WATER-FLOODED OIL FORMATION Russian patent published in 2020 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular, to methods of intensified oil extraction from enclosed formation or formation with bottom water. Method includes construction at oil-bearing section of production and injection wells, pumping of water, including reservoir, through injection wells and extraction of oil through production wells, use in corresponding wells of plants for simultaneous separate operation of formation with pumping of formation water from water-bearing part of formation to formation of area of low formation pressure and / or reduction of level of oil-water contact – OWC. Production well is extracted with water content of not less than 7 % relative to average in oil-bearing section. Building of vertical shaft of this well side descending shaft, opening water-bearing part of formation below level OWC and providing hydrodynamic connection with vertical shaft of this well, unit for dual operation (DO) is arranged in production well. Water is removed from the offshoot with DO unit and oil from the vertical borehole of the well in volumes that ensure production of the formation with water content which does not exceed the average over the oil section.

EFFECT: development of method for operation of water-flooded oil well, which allows reducing time of water withdrawal from bottom zone of productive formation.

1 cl, 1 dwg