Methods for reducing the viscosity of treatment fluids...

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/68 (2006.01) C09K 8/72 (2006.01) E21B 43/04 (2006.01)

Patent

CA 2676296

Methods are provided that include a method comprising providing a treatment fluid comprising a base fluid and a gelling agent that comprises a diutan composition; providing a breaker that comprises an acid composition; allowing the breaker to interact with the treatment fluid; and allowing the viscosity of the treatment fluid to decrease. In some embodiments, the treatment fluid may comprise a base fluid, a gelling agent that comprises a diutan composition, and a breaker that comprises an acid composition. In some embodiments, the treatment fluid may be introduced into a portion of the subterranean formation at or above a pressure sufficient to create or enhance one or more fractures in the portion of the subterranean formation. Additional methods are also provided.

La présente invention concerne des procédés dont l'un consiste à prendre un fluide de traitement comprenant un fluide de base et un gélifiant comprenant une composition au diutane, à prendre un briseur de gel comprenant une composition acide, à laisser le briseur de gel interagir avec le fluide de traitement, et à laisser décroitre la viscosité du fluide de traitement. Dans certains modes de réalisation, le fluide de traitement peut comprendre un fluide de base, un gélifiant comprenant une composition au diutane, et un briseur de fluide comprenant une composition acide. Dans certains modes de réalisation, le fluide de traitement peut être introduit dans une partie de la formation souterraine à une pression au moins suffisante pour créer ou renforcer l'une au moins des fractures dans la partie considérée de la formation souterraine. L'invention propose également des procédés annexes.

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