FIELD: chemistry.
SUBSTANCE: present disclosure relates to using a nonionic surfactant that is soluble in carbon dioxide for enhanced crude oil recovery. Method for recovering crude oil from a subterranean formation comprising injecting a nonionic surfactant in carbon dioxide into the subterranean formation, where the nonionic surfactant is prepared by an alkoxylation reaction with a double metal cyanide catalyst of a first epoxide, a second epoxide different than the first epoxide, and a branched aliphatic alcohol having 3 to 9 carbon atoms and recovering crude oil from the subterranean formation. Emulsion comprising carbon dioxide a diluent and the nonionic surfactant. Invention is developed in depending points of the formula.
EFFECT: technical result is increase in oil production.
10 cl, 4 dwg, 2 tbl, 2 ex
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|---|---|---|---|
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