Process for disruption of filter cakes

Details Process for disruption of filter cakes Process for disruption of filter cakes

C - Chemistry, Metallurgy

09

K

C09K 8/72 (2006.01) E21B 33/138 (2006.01) E21B 37/06 (2006.01)

Patent

CA 2560939

A process for producing a self-disrupting filter cake in an underground formation, which process comprises: (a) incorporating into a drilling fluid a solid polymer capable of being converted by hydrolysis into one or more organic acids; (b) using the drilling fluid to drill a wellbore into the underground formation such that the solid polymer in the drilling fluid contributes to the formation of a filter cake; and (c) allowing the solid polymer to hydrolyse in the presence of water and to disrupt the integrity of the filter cake. A drilling fluid which contains as a bridging agent one or more solid polymers capable of being converted by hydrolysis into one or more organic acids is also provided.

Cette invention se rapporte à un procédé qui permet de produire une gâteau de filtration à auto-désintégration dans une formation souterraine et qui consiste à cet effet: (a) à incorporer dans une fluide de forage un polymère solide pouvant être converti par hydrolyse en un ou plusieurs acides organiques; (b) à utiliser ce fluide de forage pour percer un trou de forage dans la formation souterraine, pour que le polymère solide du fluide de forage contribue à la formation d'un gâteau de filtration; et (c) à laisser le polymère solide s'hydrolyser en présence d'eau et à désintégrer le gâteau de filtration. Cette invention concerne également un fluide de forage qui contient comme agent de pontage un ou plusieurs polymères solides pouvant être convertis par hydrolyse en un ou plusieurs acides organiques.

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