CONTROL METHOD OF INJECTIVITY ACCEPTANCE PROFILE OF INJECTION WELL Russian patent published in 2020 - IPC E21B43/22 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil industry and, in particular, to intensification of oil recovery of oil deposits with non-uniform headers by flooding. According to the method, during development of oil deposits with heterogeneous reservoirs by flooding, a polymer gel-forming composition - PGFC containing polyacrylamide, a cross-linking agent, an additive and water - is pumped into the formation. Additive used is bactericide ATREN-bio. It is used to prevent biodestruction and reduce syneresis. Chromium acetate is used as a cross-linking agent. Complex surfactant solution is additionally pumped. PGFC injection is performed at pressure higher than crack opening pressure in high-permeable interlayer to provide additional filtration resistance in it. Said surfactant is pumped and pumped at pressure below cracks opening pressure in high-permeable interlayer. Injection is performed from the condition of surfactant ingress into less permeable interlayer and redistribution of injected water at flooding between inhomogeneous interlayers, as well as increasing rate of development and oil recovery of formation.

EFFECT: technical result is reduced intake capacity of high-permeability interlayers, involvement in active development of less permeable interlayers, as well as high rate of development and oil recovery of formation.

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