Microemulsion flooding process

Details Microemulsion flooding process Microemulsion flooding process

1975-07-03

1976-11-30

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166275, E21B 4320, E21B 4322

Patent

active

039943429

ABSTRACT:
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 C.sub.8-16 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 preferably followed by thickened water and thereafter unthickened water injected into and through the subterranean formation.

REFERENCES:
patent: 2356205 (1944-08-01), Blair et al.
patent: 3497007 (1970-02-01), Williams et al.
patent: 3734185 (1973-05-01), Jones
patent: 3799263 (1974-03-01), Prillieux et al.
patent: 3811504 (1974-05-01), Floornoy et al.

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