Improved internal breaker

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/78 (2006.01) C09K 8/514 (2006.01) C09K 8/536 (2006.01) C09K 8/74 (2006.01)

Patent

CA 2471155

A wellbore fluid including a peroxide degradable polymer and an encapsulated peroxide source. The peroxide degradable polymer may be a polysaccharide. The peroxide source may include an inorganic peroxide, including zinc and alkaline earth metal peroxides, such as magnesium peroxide. The encapsulating material may be a polymer, including enteric polymers. The release of peroxide, from peroxide sources generally, can be controlled by means of pH such that peroxide source can be activated, and peroxide released, by a change in pH. In a wellbore, this pH change can be effected by using produced fluids to lower the pH of a more basic wellbore fluid.

L'invention se rapporte à un fluide de puits de forage comprenant un polymère dégradable de peroxyde et une source de peroxyde encapsulé. Ledit polymère dégradable de peroxyde peut être un polysaccharide. La source de peroxyde peut comprendre un peroxyde non organique, notamment du zinc et des peroxydes métal alcalino-terreux, tels que le peroxyde de magnésium. La matière encapsulée peut être un polymère, notamment des polymères entériques. La libération de peroxyde, à partir de sources de peroxyde en général, peut être contrôlée au moyen du pH de sorte que la source de peroxyde peut être activée, et le peroxyde libéré par une variation du pH. Dans un puits de forage, cette variation du pH peut être effectuée par l'utilisation des fluides produits afin de réduire le pH d'un fluide de puits de forage plus basique.

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