Viscous oil recovery method

Details Viscous oil recovery method Viscous oil recovery method

E - Fixed Constructions

21

B

166/39

E21B 43/24 (2006.01) E21B 43/16 (2006.01) E21B 47/06 (2006.01)

Patent

CA 1279258

VISCOUS OIL RECOVERY METHOD (D# 78,631-F) ABSTRACT Our invention concerns a method for treating a well completed in a subterranean petroleum-containing formation which will improve the rate at which steam can be injected into the formation for a steam push-pull or steam drive oil recovery method. This preconditioning process is applied to formations exhibiting very limited steam receptivity because the formation contains high oil viscosity and has high oil saturation and is completely liquid filled. The method involves injecting a mix- ture of a non-condensable oil-insoluble gas such as nitrogen and an oil soluble gas such as carbon dioxide all in the gaseous phase into the formation at a controlled rate which will avoid permanently fracturing the formation and also avoid the immediate formation of an oil bank due to dissolution of the injected oil soluble gaseous fluid into the oil. Ideally by controlling the injection rate, the gaseous mixture first displaces water from the flow channels and then carbon dioxide slowly dissolves in the oil while nitrogen remains in the flow channels. Steam injection can then be applied to the formation without the previously experienced loss in steam injectivity.

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