Method for profile control in enhanced oil recovery

E - Fixed Constructions – 21 – B

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E21B 33/13 (2006.01) C09K 8/512 (2006.01) C09K 8/592 (2006.01) E21B 43/16 (2006.01) E21B 43/24 (2006.01)

Patent

CA 2006967

A process for profile control in a high permeability zone of a formation. A water flooding or carbon dioxide stimulation enhanced oil recovery (EOR) process is conducted in an oil-containing formation having a high permeability zone. After breakthrough occurs, the EOR process is ceased. The high permeability zone is heated to a temperature of 300°F or higher by steam injection. Subsequently, steam injection is ceased and a temperature activated mixture is injected into the high permeability zone where it forms a solid gel. Thereafter, an EOR process can be used to remove hydrocarbons from a low permeability zone.

Procédé de contrôle du profil d'une zone fortement perméable d'une formation. Le procédé de récupération assistée du pétrole (RAP) par injection d'eau ou par stimulation par le dioxyde de carbone est mis en oeuvre dans une formation pétrolifère comportant une zone très perméable. Le procédé de RAP est arrêté une fois que la percée a eu lieu. La zone très perméable est chauffée à une température de 300 degrés Fahrenheit ou plus par injection de vapeur. Par la suite, l'injection de vapeur cesse, et un mélange activé par la température est injecté dans la zone très perméable où il forme un gel solidifié. Ensuite, un procédé de RAP peut être utilisé pour enlever les hydrocarbures d'une zone peu perméable.

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