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

04

B

C04B 28/02 (2006.01) C04B 22/12 (2006.01) C04B 24/26 (2006.01) C04B 24/38 (2006.01) C04B 26/28 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2527860

The present invention provides cement compositions comprising an improved fluid loss control additive, and methods for cementing using such cement compositions. Exemplary embodiments of the cement compositions comprise a hydraulic cement, water, and a fluid loss control additive comprising an acrylamide copolymer derivative, a dispersant, and a hydratable polymer. Optionally, other additives suitable for inclusion in cement compositions may be added.

La présente invention se rapporte à des compositions pour ciment, qui contiennent un adjuvant limitant la perte de fluide amélioré, et à des procédés de cimentation faisant appel à de telles compositions pour ciment. Dans des modes de réalisation exemplaires, les compositions pour ciment contiennent un ciment hydraulique, de l'eau, et un adjuvant limitant la perte de fluide, lequel renferme un dérivé d'un copolymère acrylamide, un agent dispersant, et un polymère hydratable. D'autres adjuvants convenant à une intégration aux compositions pour ciment peuvent éventuellement être ajoutés.

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