DEVELOPMENT METHOD FOR FOUR PRODUCTION FACILITIES OF MULTILAYER OIL DEPOSIT Russian patent published in 2014 - IPC E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: method includes identification of production facilities developed by producers and injectors, optimisation of the development system, oil production through producers, injection of working fluid through injectors. According to the invention four production facilities are identified with share of more than 95% of remaining oil reserves in place. Two production facilities are related top carbonate type of reservoirs and are the sixth and tenth facilities counting from below out of ten production facilities for the whole deposit. The other two facilities are related to terrigenous type of reservoir and are the second and seventh facilities respectively. Development of the second facility is made up to the final stage, when high water cut of the product is obtained, while the seventh facility is developed up to the third stage and development of the sixth and tenth facility are made to the initial stage of development. Development rates are aligned for the facilities, to this end ratio of injectors and producers is set within the preset limits, individually for each facility. Offshoots and horizontal offshoots are made from wells in non-operating stock at each facility in designed quantity, producers are converted to injectors. Equipment for dual injection is planned. Associated stratal waters are collected at the identified facilities, mixed and prepared for the system of reservoir pressure maintenance. These waters are used as working fluid for injection through injectors at the planned facilities.

EFFECT: improving uniformity of the facilities development at multilayer deposit and increasing oil recovery.

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