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Abstract

A process utilizing an emulsion of a carbon dioxide phase and an aqueous phase is provided to enhance oil recovery from a subterranean formation. The aqueous phase is in a liquid state and is made up of a water-soluble polymer and surfactant dissolved within an aqueous solvent. The emulsion is prepared by condensing the carbon dioxide to a supercritical state under elevated pressure either at the surface or in situ. The carbon dioxide phase is mixed with the aqueous phase either prior to, simultaneous with, or subsequent to the condensation step. Placement of the emulsion in the formation via an injection well enables recovery of oil from the formation via a production well in accordance with one of several embodiments. In one embodiment, the emulsion functions as an oil displacement fluid. In other embodiments, the emulsion functions as a mobility control fluid or a conformance improvement treatment composition in conjunction with an oil displacement flood.

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First Claim