Improvement in enhanced oil recovery by polymer without...

E - Fixed Constructions – 21 – B

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E21B 43/20 (2006.01) C09K 8/588 (2006.01) E21B 47/10 (2012.01)

Patent

CA 2745911

Method for enhanced oil recovery in an oil-bearing formation having high permeability zones constituting preferential passages for the injected liquid consisting in: a) treating the preferential passages by injection into the formation of an aqueous solution based on watersoluble polymers at a concentration such that the viscosity of the aqueous solution is higher than that of the oil, b) once step a) is completed, an aqueous solution is injected having an identical composition to that used in b) at a lower polymer concentration.

La présente invention concerne un procédé amélioré de récupération de pétrole dans une formation pétrolifère comportant des zones de forte perméabilité qui constituent des passages préférentiels pour le liquide injecté, lequel procédé consiste à a) traiter les passages préférentiels en injectant dans la formation une solution aqueuse basée sur des polymères hydrosolubles à une concentration telle que la viscosité de la solution aqueuse est supérieure à celle du pétrole, et b) une fois l'étape a) achevée, injecter une solution aqueuse ayant une composition identique à celle utilisée en a), mais avec une concentration inférieure en polymères.

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