Encapsulated acid composition and process for preparing and...

E - Fixed Constructions – 21 – B

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E21B 43/267 (2006.01) B01J 13/14 (2006.01) C09K 8/72 (2006.01) C09K 8/92 (2006.01)

Patent

CA 2102769

An encapsulated acid composition includes an aqueous solution of acid encapsulated in a polymeric material which is chemically resistant to the acid in the aqueous solution of acid and which polymeric material is substantially impermeable to water and acid. The composition is prepared according to a process including the steps of forming an emulsion having a continuous phase of oil and a dispersed phase of an aqueous solution of acid; mixing the emulsion with a polymer which is soluble in said oil and insoluble in the aqueous solution of acid, the polymer being chemically resistant to the acid in the aqueous solution of acid and the polymer being substantially impervious to the acid and to water; and mixing the emulsion and the polymer with a cross-linking agent so as to encapsulate droplets of the dispersed phase of the aqueous solution of acid in a cross-linked polymer encapsulant.

Une composition acide encapsulée comprend une solution aqueuse d'acide encapsulée dans une matière polymérique qui est chimiquement résistante à l'acide présent dans la solution aqueuse d'acide et laquelle matière polymérique est substantiellement imperméable à l'eau et à l'acide. La composition est préparée conformément à un procédé comprenant les étapes suivantes : former une émulsion ayant une phase continue constituée d'huile et une phase dispersée constituée d'une solution aqueuse d'acide; mélanger l'émulsion avec un polymère qui est soluble dans ladite huile et insoluble dans la solution aqueuse d'acide, le polymère étant chimiquement résistant à l'acide présent dans la solution aqueuse d'acide et le polymère étant substantiellement imperméable à l'acide et à l'eau; et mélanger l'émulsion et le polymère avec un agent de réticulation de manière à encapsuler des gouttelettes de la phase dispersée constituée de la solution aqueuse d'acide dans un polymère encapsulant réticulé.

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