FIELD: oil and gas industry.
SUBSTANCE: invention relates to the oil industry and can be used for enhanced oil recovery heavy oil reservoir with low temperature by insulation or limitation of water to oil wells. Structure for enhanced oil recovery, containing urea, aluminum salt, and water methenamine further comprises methyl cellulose and glycerol in the following ratio, wt.%: 2.0-25.0 urea, aluminum salt 2.0-10.0, methylcellulose 0.5-1.5, 2.0-8.0 methenamine, 0-30.0 glycerin, water rest. Method for preparing the above composition comprising hexamine dissolved in water, addition of urea, stirring, adding a solution of glycerol and premixed 1.0-2.0% methylcellulose solution, stirring until complete dissolution, the addition of said aluminum salt with stirring until complete dissolution. Invention is developed in subclaims.
EFFECT: raising efficiency of composition.
3 cl, 11 ex, 2 tbl, 2 dwg
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