METHOD FOR DEVELOPMENT OF DOME OIL FORMATION AT LAST OPERATIONAL STAGE Russian patent published in 2015 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: in the method for development of dome oil formation at last operational stage extraction of the product is made through producers and working fluid is injected through injectors. Local area of the deposit is selected according to difference of hypsometric depths between the producer and injector per 3 m and more. In the producer standard downhole pumping equipment is replaced by downhole pumping equipment operable on round-the-clock basis. When change in water cut per 10-15% is detected volume of extracted product is limited due to change in operation time of round-the-clock downhole pumping equipment. At that at the injector area injection is limited or the well is shut in completely. Periodic measurements are made for water cut changes in operation mode of the producer. When water cut is reduced operation is continued in elastic drive without start-up of the influencing injector. Periodic measurements of water cut and bottomhole pressure are repeated for the producer. When bottomhole pressure is reduced per 5% and more in regard to the initial measured value the injector operation is started and change in the main parameters of water cut and bottomhole pressure is controlled in the producers.

EFFECT: higher oil recovery of the deposit.

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