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

FIELD: oil and gas industry.

SUBSTANCE: during development of multilayer oil deposit working fluid is injected through injectors with common well screen. Extraction of the reservoir product through producers is also performed with common well screen. The upper layer is developed in the mode of injection to withdrawal ratio by injection of working fluid at discharge pressure according to injectivity of the stratum. A pit is arranged close to the injector and working fluid is pumped through this pit to the injector with increased injection pressure sufficient for entry of working fluid both to the upper and lower strata. Producers are operated in the mode of permanent bottomhole pressure. Upon reaction of the producers to increased pressure of working fluid injection the development is continued in the mode of injection to withdrawal ratio by injection of working fluid. Injection to withdrawal ration is redistributed for two strata simultaneously from producers with high water cut and high bottomhole pressure to producers with low water cut and low bottomhole pressure. For this purpose at producers with increasing water cut operation time of pumping equipment is reduced at permanent bottomhole pressure. At producers with low water cut operation time of pumping equipment is increased at permanent bottomhole pressure.

EFFECT: improving oil recovery of the deposit.

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