DEVELOPMENT METHOD OF OIL DEPOSITS IN CARBONATE RESERVOIRS WITH WATER-OIL ZONES Russian patent published in 2012 - IPC E21B43/00 

FIELD: oil and gas industry.

SUBSTANCE: development method of oil deposits in carbonate reservoirs with water-oil zones involves drilling of vertical production and injection wells and wells with horizontal sections, intensification of oil production by pumping of chlorhydric acid, pumping of working agent to injection wells and oil extraction through production wells. Horizontal sections are performed in rows of vertical production wells. Acid is pumped in series to vertical wells in which horizontal section has been made, starting from the well which is the closest one to working face of horizontal section, with creation of hydrodynamic connection between vertical well to which the acid is pumped and horizontal section. When the time for the acid reaction elapses, reaction products are extracted from well shaft with horizontal section; then, some part of section is cut off so that hydrodynamic connection is formed between vertical well to which the acid has been pumped and the part of horizontal section, which is appropriate to it.

EFFECT: enlarging the coverage of oil deposit in carbonate reservoirs with water-oil zones, intensification of oil extraction, increasing oil removal coefficient with simultaneous cheapening of the process.

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