METHOD FOR IMPACT ON BEDDING WITH INHOMOGENEOUS COLLECTORS Russian patent published in 2021 - IPC E21B43/22 E21B43/26 C09K8/60 C09K8/508 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry, in particular to methods of increasing oil recovery from oil fields with heterogeneous reservoirs by leveling the injectivity profile of water injection wells and increasing the sweep of the reservoir by flooding. The method of influencing an oil reservoir with heterogeneous reservoirs includes alternating injection of water rims through at least one injection well and oil withdrawal through at least one production well. Injected as rims, in% of the total volume: first a rim of a clay suspension with a clay concentration of 20-80 kg / m³ 40-60, then sequentially: a rim containing an inorganic alkaline agent with a concentration of 2-5 kg ​​/ m³, 5-15 , a rim in the form of a dispersion of polyacrylamide with its concentration of 0.8-1.25 kg / m³ with the addition of the ATREN-BIO bactericide with its concentration of 0.1-0.15 kg / m³ 25-55, and additionally pumping a solution of a complex surfactant substances with a concentration of 3 kg / m3 with a solution volume of 20-50 m³. The injection is carried out at the maximum allowable speed of the pumping unit at a pressure higher than the fracture opening pressure in a highly permeable reservoir interval.

EFFECT: increased oil recovery of a heterogeneous formation due to increased volume of plugging sediment, a more complete coverage of the formation by the action and increased oil-washing properties of the composition.

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