MULTILAYER OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2014 - IPC E21B43/14 E21B43/12 

FIELD: oil and gas industry.

SUBSTANCE: method involves opening of strata by injectors and producers, injection of working fluid and recovery of the product. The section is selected where at least 20 thousand t of remaining reserves are available for each producer, an injector is selected with three perforated strata, to the lower stratum with the biggest permeability injection of working fluid is limited up to minimum values of 40 m³/day as the most, unlimited, as maximum as possible injection of the working fluid is done to other strata. The injector is operated in this mode, status of producers in the second stratum is analysed; when bottomhole pressure increases per 10-15% and water cut increases per 40% in the nearest producer of the second stratum, intensification of the operation mode is made for the producer. When bottomhole pressure increases per 10-15% and water cut increases per 40% in the nearest producer of the second stratum complete or partial limitation of injection is done for the second stratum. Control is carried out over bottomhole pressure in the area of complete or partial limitation of injection for the lowest and the most permeable stratum, and when decrease in bottomehole pressure per 10-15% below saturation pressure is confirmed injection volumes are increased in order to prevent decrease in oil recovery volume. Limitation of injection to the most permeable stratum and status analysis of the producers in the second stratum are repeated periodically.

EFFECT: improving oil recovery of the deposit.

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