Set retarders for foamed cements

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 24/18 (2006.01) C04B 24/24 (2006.01) C04B 28/02 (2006.01) C04B 38/10 (2006.01) C09K 8/46 (2006.01)

Patent

CA 2407640

An improved non-dispersing set retarder additive for foamed cements, cement compositions containing the additive, and methods of cementing in a subterranean zone penetrated by a well bore are provided. The set retarder additive includes a blend of a sulfonated lignin, preferably a lignosulfonate, with an alkali lignin, preferably a kraft lignin, having an organic sulfur content of 0-3.5 % by weight in a ratio of about 6:4 to 8:2. The methods are basically comprised of the steps of preparing a foamed cement composition comprised of hydraulic cement, a non-dispersing set retarder, sufficient water to form a slurry, sufficient gas to foam the slurry and a foaming and foam stabilizing surfactant present in an amount sufficient to facilitate the formation of the foam and stabilize the foamed cement composition.

L'invention concerne un additif de retardateurs de durcissement, non dispersant et amélioré destiné à des ciments-mousse, des compositions de ciment renfermant l'additif et des procédés de cimentation destinés à une zone souterraine dans laquelle un puits de forage est placé. L'additif de retardateur de durcissement comprend un mélange d'une lignine sulfonée, de préférence, un lignosulfonate, avec une lignine alcali, de préférence, une lignine kraft, possédant une teneur en souffre organique comprise entre 0 et 3.5 % en poids dans un rapport d'environ 6: 4 à 8: 2. Les procédés comprennent à la base les étapes consistant à préparer une composition de ciment-mousse renfermant du ciment hydraulique, un retardateur de durcissement non dispersant, de l'eau en quantité suffisante en vue de former une suspension, du gaz en quantité suffisante de manière à mousser la suspension, un moussage, ainsi qu'un tensio-actif stabilisant la mousse présent en quantité suffisante en vue de faciliter la formation de la mousse et de stabiliser la composition de ciment-mousse.

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