MULTILAYER OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2015 - IPC E21B43/14 E21B43/26 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: at development of multilayer oil deposit the product is extracted from the layer through producers and injection of operating fluid is made through injectors, and hydraulic fracturing is performed in an injector. Before hydraulic fracturing, the operating fluid is injected to the lower productive layer when operating fluid is not accepted by the upper layer. Hydraulic fracturing of the upper productive layer is made in the injector. Productive layers are isolated and separate injection of the operating fluid is arranged to productive layers. Close to the injector a pit is made and the operating fluid is injected through this pit to the upper productive layer at increased injection pressure. When bottomhole pressure is increased in the reacting producer, extraction of the product from the layer is increased. Operation modes for wells are regulated for each productive layer and optimal injection to withdrawal ratio is reached. Development is continued with maintenance of optimal injection to withdrawal ratio for each productive layer.

EFFECT: higher oil recovery.

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