METHOD OF PRODUCING HIGH-VISCOSITY OIL FROM WELLS WITH PRESENCE OF BOTTOM WATER Russian patent published in 2025 - IPC E21B43/22 

FIELD: mining.

SUBSTANCE: invention relates to a method of extracting high-viscosity oil from formations with bottom water. Method includes cyclic operation of well with use both for injection at injection of carbon dioxide and for oil production, with injection of carbon dioxide under water-oil contact. Under water-oil contact perforation is performed for isolating screen. After that, in zone of water-oil contact there created is insulating screen preventing penetration of carbon dioxide and/or bottom water to production well. After formation of an insulating screen, a packer is installed at this interval. After that formation is perforated under isolating screen for repeated multiple pumping of carbon dioxide as it is depleted at oil production. After pumping of carbon dioxide above the packer, a blind plug is installed in the mounting seat of the string disconnector. After that, tubing strings are disconnected in the string disconnector and lifted to the roof of the productive formation, after which the productive formation is perforated with subsequent oil production.

EFFECT: prevention of breakthrough of injected carbon dioxide and/or bottom water to the well during operation in production mode.

2 cl, 4 dwg