C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/487 (2006.01) C04B 24/28 (2006.01) C04B 28/02 (2006.01)
Patent
CA 2674019
A cement composition comprising water, a cement, and a fluid loss control additive, the fluid loss control additive comprising a graft copolymer. The graft copolymer comprises a backbone and at least four grafted monomers selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, acrylic acid, vinylphosphonic acid, diallyldimethylammonium chloride, and salts thereof. The backbone of the graft copolymer comprises a humic acid salt. The cement compositions may be used in cementing operations.
L'invention porte sur une composition de ciment qui comprend de l'eau, un ciment et un additif régulateur de perte de fluide, l'additif régulateur de perte de fluide renfermant un copolymère greffé. Le copolymère greffé comprend un squelette et au moins quatre monomères greffés choisis dans le groupe composé de l'acide 2-acrylamido-2-méthylpropanesulfonique, de l'acrylamide, de l'acide acrylique, de l'acide vinylphosphonique, du chlorure de diallyldiméthylammonium, et de sels de ces derniers. Le squelette du copolymère greffé comprend un sel d'acide humique. Les compositions de ciment de l'invention peuvent être utilisées dans des opérations de cimentation.
Brenneis Darrell Chad
Chatterji Jiten
King Bobby J.
Lewis Samuel J.
Halliburton Energy Services Inc.
Norton Rose Canada S.e.n.c.r.l.,s.r.l./llp
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