FIELD: oil and gas industry.
SUBSTANCE: present invention relates to increasing oil recovery when hydrocarbons do flow under natural forces. Dispersion for enhanced crude oil recovery, comprising carbon dioxide in a liquid or a super critical state, a diluent from a group consisting of water, brine, connate water, surface water, distilled water, water enriched with carbon dioxide, sea water and combinations thereof and a nonionic surfactant provided by an alkoxylation reaction of a first epoxide, a second epoxide different from first epoxide, and a primary aliphatic amine covalently linked to a tertiary carbon of a C4-C30 branched alkyl monoamine. Invention is developed in subclaims.
EFFECT: high efficiency of water flooding.
10 cl, 8 ex, 3 tbl, 2 dwg
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