FIELD: oil and gas industry.
SUBSTANCE: invention is related to the improved oil recovery method. Secondary oil recovery method for an oil-bearing bed having high permeability areas forming the preferred passages for injected liquid, which consists in the following stages: a) blocking of the preferred passages by injection to the bed of aqueous solution based on water-soluble polymers with concentration ensuring large viscosity of the aqueous solution in comparison with oil viscosity, b) upon completion of the stage a) injection of the aqueous solution identical in composition with the solution used at the stage a) with lower concentration of the polymer. Invention is developed in dependent claims.
EFFECT: improving efficiency at reduction of polymer in respect of the recovered oil.
11 cl, 1 ex
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