LAYERED OIL RESERVOIR DEVELOPMENT METHOD Russian patent published in 2021 - IPC E21B43/20 

FIELD: oil industry.

SUBSTANCE: method includes the construction of a grid of production and injection wells, cyclic injection of a working agent through injection wells and product selection through production wells, and the injection of a working agent into injection wells is carried out with a frequency and duration depending on the water cut of the product from the production wells. Production wells, the water cut of which is at least 5% higher than the average for the reservoir, are selected for cyclic sampling, and injection wells are selected for cyclic injection, which, based on hydrodynamic and / or geophysical studies, have a direct effect on the water cut of the produced product from the selected production wells. The period of stopping the injection of injection wells depends on the operating mode at this time of one of the selected production wells corresponding to them, in order to ensure during the shutdown of injection by withdrawing the product - reducing the pressure in it to a limited one - by 5-10% above the critical one, causing irreversible processes in the rock and formation fluid. Then the sampling is stopped until an initial constant pressure after growth is obtained, which is fixed. Then the sampling is resumed at least once until the pressure drops to the limited one with stopping and restoring to constant pressure until it becomes at least 30% lower than the initial one. After that, the injection into the corresponding injection wells is switched on, and the withdrawal from the production well is resumed at the initial level until the water cut of the production from the production well is at least 5% higher than the average for the reservoir. And the cycles of stopping injection through injection wells and withdrawing from the corresponding production well, repeating.

EFFECT: increasing the recovery of products from low-permeability layers of the reservoir due to only the use of hydrodynamic action with the use of the overflow of products of the reservoir from low-permeability layers to high-permeability.

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