METHOD FOR INCREASING OIL RECOVERY OF DEPOSIT IN CARBONATE RESERVOIRS OF FRACTURE-PORE TYPE Russian patent published in 2013 - IPC E21B43/27 E21B33/138 

FIELD: oil and gas industry.

SUBSTANCE: method for increasing oil recovery of the deposit in carbonate reservoirs of fracture-pore type involves formation of a group of production wells with an injection well in the centre so that the injection well can be located in the lower part of the deposit structure in relation to production wells, oil recovery from the group of wells watered out with bottom water, forced extraction of fluid from the injection well till the response of the neighbouring wells to that action and reduction of formation pressure in the area of responding production wells. After steady reduction of formation pressure in the area of responding production wells by more than 10 %, each of them is pumped with waterproof compound that is strengthened under action of chlorhydric acid in the volume of 15-20 m³. After waterproof compound is cured, forced extraction of the fluid is stopped and acid bearing compound in the volume of 0.4-1.0 m³ per metre of oil saturated part of the formation is pumped to each well treated with waterproof compound. Responding production wells are brought into operation.

EFFECT: increasing the effective operating period of wells by 18-24 months with reduction of water cutting of well production, increasing oil recovery in the deposit area.

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