Compositions and methods for treating lost circulation

Details Compositions and methods for treating lost circulation Compositions and methods for treating lost circulation

C - Chemistry, Metallurgy

09

K

C09K 8/487 (2006.01) C04B 28/00 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2524966

A cement system for use in treating lost circulation includes a slurry of cement, water and a super-absorbent polymer which absorbs free water in the slurry to form a gel - ore preferably a solid-like structure - when placed in the well, and which releases the absorbed water to the cement hydration reaction as the cement sets. The absorption of water causes the slurry to develop a solid-like structure. In one embodiment, the superabsorbent is polyacrylamide or modified crosslinked poly(meth)acrylate. Also presented is a method of treating lost circulation by pumping the above-mentioned cement system.

L'invention porte sur un système de ciment destiné à être utilisé dans le traitement de la perte de circulation, ce système comprenant une boue de ciment, de l'eau et un polymère super-absorbant qui absorbe l'eau libre de la boue de façon à former un gel minerai, de préférence une structure de type solide lorsqu'il est placé dans le puits, et qui libère l'eau absorbée dans la réaction d'hydratation du ciment au moment de la prise du ciment. L'absorption de l'eau fait que la boue forme une structure de type solide. Selon une forme d'exécution, le super-absorbant est un polyacrylamide ou un poly(méth)acrylate réticulé, modifié. L'invention porte également sur un procédé de traitement de la perte de circulation par pompage du système de ciment précité.

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