Wellbore fluid and methods of treating an earthen formation

Details Wellbore fluid and methods of treating an earthen formation Wellbore fluid and methods of treating an earthen formation

C - Chemistry, Metallurgy

09

K

C09K 8/035 (2006.01) C09K 8/512 (2006.01) C09K 8/575 (2006.01)

Patent

CA 2754359

The present application describes improved compositions for wellbore fluids for use in downhole (e.g. oilwell) applications. The compositions comprise a blocked isocyanate (BI) component having a tolerance improving group (such as a hydrophilic group, e.g. an amine) bonded to it, and an active hydrogen component. When the BI group is unblocked, it reacts with the active hydrogen component to form a gel which, by virtue of the tolerance improving group, is more tolerant to contaminants (such as aqueous inorganic salts or brines) than the corresponding gel forms from unmodified BI. The application also relates to methods of treating an earthen formation using such a composition.

La présente invention concerne des compositions améliorées pour fluides de forage de puits destinés à être utilisés dans des applications de forage (par exemple des puits de pétrole). Les compositions comprennent un constituant isocyanate bloqué (BI) ayant un groupe améliorant la tolérance (tel qu'un groupe hydrophile, par exemple une amine) lié à celui-ci, et un constituant d'hydrogène actif. Lorsque le groupe BI n'est pas bloqué, celui-ci réagit avec le constituant d'hydrogène actif afin de former un gel qui, du fait de l'existence du groupe améliorant la tolérance, est plus tolérant vis-à-vis des contaminants (tels que les sels inorganiques aqueux ou des saumures) que les formes de gels correspondants provenant du BI non modifié. L'invention concerne également des procédés de traitement d'une formation terrestre utilisant une telle composition.

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