FIELD: oil and gas industry.
SUBSTANCE: oil recovery composition comprises: dimeric nonionic surfactant of the present structural formula I or a regioisomer thereof and/or trimeric nonionic surfactant of the present formula II and carbon dioxide. The oil recovery method comprises: providing a flow of carbon dioxide to the oil pool, introducing said dimeric nonionic surfactant or its regioisomer into the carbon dioxide flow to form the mixture and injecting the mixture into the oil pool. The invention has been developed in the dependent claims.
EFFECT: improving the efficiency of the method.
9 cl, 1 dwg, 3 tbl, 3 ex
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