OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2024 - IPC E21B43/16 

FIELD: mining.

SUBSTANCE: invention relates to a method of developing an oil deposit. Method includes drilling of production horizontal and vertical injection wells. Method also involves pumping of a displacement agent through vertical injection wells. Also, the method involves extraction of products through horizontal production wells. Method also includes drilling one or more horizontal production wells in a formation with a thickness of at least 10 m above the bottom of the deposit of at least 3 m, also, vertical injection well is drilled at distance of 1/3 of the approved interwell space of the production well stock on the deposit from the bottomhole of the horizontal production well. Also, secondary opening of the deposit is performed in the vertical injection well above the hypsometric mark of the deposit bottom, but not above the position of the horizontal shaft of the production well. Lower water-bearing stratum is also exposed. Then pumping is performed by downhole pumping in vertical injection well from lower water-bearing formation with pressure 10 % higher than initial formation pressure and injection cycle of 7 days of injection and 5 days of downtime.

EFFECT: increased production of residual oil reserves and oil recovery and prevention of premature flooding.

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