Method for foam emplacement in carbon dioxide enhanced recovery

Details Method for foam emplacement in carbon dioxide enhanced recovery Method for foam emplacement in carbon dioxide enhanced recovery

E - Fixed Constructions

21

B

166/16

E21B 43/22 (2006.01) E21B 43/25 (2006.01)

Patent

CA 1277227

METHOD FOR FOAM EMPLACEMENT IN CARBON DIOXIDE ENHANCED RECOVERY ABSTRACT The permeability of higher permeability zones of a subterranean reservoir of heterogeneous permeability is reduced by injecting an aqueous solution of a water soluble surface active agent and then a gas mixture comprising carbon dioxide and a noncondensible, non-hydrocarbon gas insoluble in viscous crude. A stable foam forms in situ useful for blocking escape of solvent fluids into the higher permeability zones of the reservoir during enhanced recovery, typically by carbon dioxide flooding. Preferably, the solution of surface active agent and the gas mixture are injected in alternating slugs to enhance foam formation.

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