High conformance oil recovery process

Details High conformance oil recovery process High conformance oil recovery process

E - Fixed Constructions

21

B

166/33

E21B 33/138 (2006.01) C09K 8/584 (2006.01) E21B 43/16 (2006.01)

Patent

CA 1102683

ABSTRACT OF THE DISCLOSURE The conformance of an enhanced oil recovery process, including waterflood, surfactant or other chemical- ized water flood process, in a formation containing at least two strata or zones of varying permeability, the permeability of one zone being at lea t 50 percent greater than the permeability of the other zone, is improved by flooding until the higher permeability zone has been depleted, after which an aqueous fluid is injected into the high permeability zone, said fluid having relatively low viscosity at the time of injection and containing a blend of surface active agents which promote the formation of a coarse viscous emulsion in the flow channel of the formation which reduces the permeability of the high permeability zone. After the permeability of the first zone ha been reduced substantially, flooding may then be accomblished in the second zone which was originally not invaded by the injected oil recovery fluid. The surface active agents are individually tailored and the ratio of dissimilar surfactants balanced to exhibit optimum viscous emulsion formation properties. The optimum emulsifying surfactant comprise mixture of an organic sulfonate such as petroleum sulfonate and a solubilizing co-surfactant such as an alkyl or alkylarylpolyalkoxy alkylene sulfonate and/or a low molecular weight alcohol. -I-

326637

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