Cement fluid loss additive

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 20/56 (2006.01) C04B 24/16 (2006.01) C04B 24/26 (2006.01)

Patent

CA 2416435

A novel method for making improved cement fluid loss additives comprising copolymers of acrylamide having desirable viscosity and fluid loss control properties. The method combines (1) the use of oxygenated make-up water to dissolve acrylamide monomers, derivatives or mixtures thereof to form a reaction mixture for polymerization of the monomers with (2) a second "condition" or set of conditions. The second "condition" or set of conditions is either (a) using of two heating stages to induce polymerization, or (b) adding a small amount of acrylic acid to the reaction mixture before exposing the reaction mixture to a temperature sufficient topolymerize the monomers. The two heating stages of (a) involve (i) an initial, lower temperature stage followed by (ii) a higher temperature stage.

L'invention concerne un nouveau procédé permettant d'améliorer des additifs pour ciment destinés à empêcher les pertes de fluides. Ces additifs comprennent des copolymères d'acrylamide à viscosité désirée et à propriétés de régulation de pertes de fluides. Ce procédé combine (1) de l'eau oxygénée d'appoint permettant de dissoudre les monomères d'acrylamide, des dérivés ou des mélanges de ceux-ci afin de former un mélange de réaction destiné à polymériser lesdits monomères au moyen (2) d'une étape ou d'un ensemble d'étapes qui consistent soit à a) utiliser deux étages de chauffage pour induire la polymérisation, soit à ajouter une petite quantité d'acide acrylique au mélange de réaction avant de l'exposer à une température suffisante pour polymériser les monomères. Les deux étages de chauffage impliquent i) un étage de faible température suivi ii) d'un étage de température élevée.

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