C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/46 (2006.01) C04B 24/38 (2006.01) C04B 28/02 (2006.01) C04B 28/04 (2006.01) E21B 33/138 (2006.01)
Patent
CA 2506554
Methods of cementing in subterranean zones, improved cement compositions and improved additives are provided. The compositions are basically comprised of a hydraulic cement, sufficient water to form a slurry and an additive for providing improved rheology, fluid loss control and set retardation comprised of carboxymethylhydroxyethylcellulose having in the range of from about 0.62 to about 2.21 moles of hydroxyethyl substitution and in the range of from about 0.44 to about 0.52 degrees of carboxymethyl substitution and a 2% by weight aqueous solution of the carboxymethylhydroxyethylcellulose has a Hoppler viscosity in the range of from about 55 mPa.s to about 359 mPa.s.
L'invention a trait à des procédés de cimentation en zones souterraines, à des compositions de ciment améliorées et à des additifs améliorés. Les compositions sont essentiellement constituées d'un ciment hydraulique, d'une quantité d'eau suffisante pour former un coulis, et d'un additif présentant des propriétés améliorées en matière de rhéologie, de réduction du filtrat et de temps de prise, ledit additif étant du carboxyméthylhydroxyéthylcellulose possédant entre environ 0,62 et environ 2,21 moles de substitution hydroxyéthyle et environ 0,44 à environ 0,52 degrés de substitution carboxyméthyle, une proportion du carboxyméthylhydroxyéthylcellulose égale à 2 % en poids de solution aqueuse présentant une viscosité Höppler comprise entre environ 55 mPa.s et environ 359 mPa.s.
Brenneis Darrell C.
Chatterji Jiten
Cromwell Roger S.
King Bobby J.
Halliburton Energy Services Inc.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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