DEVELOPMENT METHOD OF OIL DEPOSIT IN FRACTURED RESERVOIRS Russian patent published in 2013 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: method involves arrangement of production and injection wells, pumping of displacement liquid through injection wells and extraction of the product through production wells. According to the invention, the first injection well is developed for pumping of displacement liquid with development of interval of oil-water contact (OWC) of the formation. Extraction of the product is performed from production wells with developed oil-saturated intervals of the formation, which envelop it. To the first injection well there performed is cyclic pumping of displacement liquid with 400-500% of compensation of product extraction from production wells enveloping it. After flooding in fractures of one of production wells enveloping the first injection well, isolation of the developed oil-saturated interval of the formation in the same well is performed with development in it of interval of OWC of the formation and with its being changed over to the second injection well for pumping of displacement liquid with 400-500% compensation of the product extraction from production wells enveloping it after flooding in fractures of one of the production wells enveloping the second injection well. Isolation of oil-saturated interval of the formation is performed in the same well with development in it of OWC interval and with its change-over to the third injection well. Gradually, as fractures are being developed, a row of injection wells is created on the oil deposit, to which displacement liquid is pumped. After flooding for 70-80% of production wells enveloping each of the injection wells, that injection well is changed over to extraction of the product after the development interval is changed from OWC to oil-saturated interval of the formation.

EFFECT: increasing the efficiency of the method.

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