Method for plugging gas migration channels in the cement...

E - Fixed Constructions – 21 – B

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E21B 33/13 (2006.01)

Patent

CA 2212977

A process for mitigating the effects of gas migration through channels in a cement sheath in a hydrocarbon production well by injecting a mixture of a carrier fluid with a dissolved polymer into the sheath and dropping the polymer out of solution to form polymers to plug the channels. The process utilizes the phase transition parameters of the mixture coupled with well conditions and/or injection parameters to cause the polymer to drop out of solution within the gas migration channels. The mixture can be injected through well perforations in the producing zone or perforations made in the wellbore adjacent the gas migration zone or directly into the cement sheath at the wellhead.

Procédé d'atténuation des effets de la migration des gaz par des canaux dans la gaine de ciment d'un puits de production d'hydrocarbures consistant à injecter un mélange d'un fluide transporteur avec un polymère dissous dans la gaine et à expulser le polymère de la solution pour former des polymères en vue de boucher les canaux. Le procédé fait appel aux paramètres de transition de phase du mélange ainsi qu'aux conditions présentes dans le puits et/ou aux paramètres d'injection pour provoquer l'expulsion du polymère de la solution dans les canaux de migration du gaz. Le mélange peut être injecté par des perforations du puits dans la zone productive ou par des perforations pratiquées dans le trou de forage près de la zone de migration des gaz ou directement dans la gaine de ciment à la tête de puits.

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