Recovery of oil using microemulsions

Details Recovery of oil using microemulsions Recovery of oil using microemulsions

C - Chemistry, Metallurgy

09

K

31/13, 166/31

C09K 8/584 (2006.01) E21B 43/16 (2006.01) E21B 43/20 (2006.01)

Patent

CA 1040409

ABSTRACT OF THE DISCLOSURE Crude oil is a subterranean formation is recovered through the in- jection of at least one phase formed from a composition within the multi- phase region of an oil-water-surfactant ternary diagram. One embodiment includes the injection of two or more mutually immiscible phases which would be in phase equilibrium within the multiphase region in the ternary diagram of a microemulsion system, at least one of the phases being a microemulsion. Low interfacial tensions exist between the immiscible phases in equilibrium. Where one of the phases in equilibrium comprises predominantly oil or pre- dominantly water, in a further embodiment the microemulsion phase in equi- librium therewith can be injected alone to achieve efficient crude oil re- covery. Where there are three phases in equilibrium, one of which comprises predominantly oil and another comprises predominantly water, in a further embodiment the remaining microemulsion phase in equilibrium therewith can be injected alone to achieve efficient crude oil recovery.

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