Microemulsion flooding process comprising alkyl xylene...

Details Microemulsion flooding process comprising alkyl xylene... Microemulsion flooding process comprising alkyl xylene...

C - Chemistry, Metallurgy

09

K

31/13, 166/31, 1

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

Patent

CA 1046258

ABSTRACT OF THE DISCLOSURE Crude oil remaining in a subterranean formation is recovered through the injection of a microemulsion comprising an oil, i.e. a refined or crude oil, an aqueous medium and as a surfactant, a C8-16 orthoxylene sulfonate. The aqueous medium is preferably a brine having a salt concentration of up to about 2-1/2% by weight, although increased brine tolerance can be achieved by inclusion of a cosurfactant within the microemulsion. When utilized in the secondary or tertiary recovery of crude oil, the microemulsion is prefer- ably followed by thickened water and thereafter unthickened water injected into and through the subterranean formation.

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