Process for recovering hydrocarbon fluids from a subsurface...

Details Process for recovering hydrocarbon fluids from a subsurface... Process for recovering hydrocarbon fluids from a subsurface...

E - Fixed Constructions

21

B

166/33

E21B 43/24 (2006.01) C09K 8/594 (2006.01)

Patent

CA 1119092

A B S T R A C T A relatively viscous oil is produced from a subterranean reservoir by establishing a hot channel of preferential per- meability through the reservoir between injection and production locations, then flowing through the reservoir a hot foam of aqueous liquid, non-condensable gas and surfactant, and con- trolling the mobility of the foam so that heated oil is produced and hot fluid is flowed through portions of the reservoir within and outside the channel of preferential permeability.

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