Oil recovery process using a tapered surfactant...

Details Oil recovery process using a tapered surfactant... Oil recovery process using a tapered surfactant...

E - Fixed Constructions

21

B

166/33

E21B 43/22 (2006.01)

Patent

CA 1069043

OIL RECOVERY PROCESS USING A TAPERED SURFACTANT CONCENTRATION SLUG (D#74,012-FB) ABSTRACT OF THE DISCLOSURE A process for recovering oil from a subterranean reservoir in which a surfactant slug injected into the forma- tion via an injection well is passed through the formation and oil is recovered via a production well penetrating the formation. In this process a tapered surfactant concentration slug is employed in which the surfactant concentration is increased, either incrementally or gradually, during the slug injection time. The slug can be a simple aqueous solution of the surfactant, a hydrocarbon-in- water emulsion containing the surfactant or an aqueous solu- tion of a polymer containing the surfactant.

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