Cement compositions with improved fluid loss characteristics...

Details Cement compositions with improved fluid loss characteristics... Cement compositions with improved fluid loss characteristics...

C - Chemistry, Metallurgy

09

K

C09K 8/487 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2525817

The present invention provides cement compositions comprising an improved fluid loss control additive, and methods for cementing in a subterranean formation using such cement compositions. The cement compositions comprise a hydraulic cement, water, and a fluid loss control additive comprising at least two polymers connected by a pH-sensitive crosslink. Optionally, other ingredients may be included in the compositions.

La présente invention concerne des compositions de ciment qui renferment un additif amélioré de régulation des pertes de fluide et des procédés de cimentation pour une formation souterraine dans lesquels on utilise de telles compositions de ciment. Les compositions de ciment comprennent un ciment hydraulique, de l'eau et un additif de régulation des pertes de fluide renfermant au moins deux polymères reliés par une réticulation sensible au pH. D'autres ingrédients peuvent également être incorporés dans les compositions.

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