Low density, high yield cement slurry formulation and method...

Details Low density, high yield cement slurry formulation and method... Low density, high yield cement slurry formulation and method...

C - Chemistry, Metallurgy

04

B

C04B 28/04 (2006.01) C04B 28/06 (2006.01) C04B 28/26 (2006.01) C09K 8/46 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2586346

A cement mix for cementing the well casing within a wellbore which contains a synergistic blend of an alkali metasilicate and/or alkali silicate, aluminum silicate and either silica fume or micro silica quartz along with a Portland cement. The cement mix, when combined with mix water, may render a cementitious slurry having a density less than or equal to 11.5 pounds per gallon (ppg); the amount of mix water in the cementitious slurry being between from about 200 to about 560 percent by weight of cement (BWOC). The compressive strength of such cementitious slurries, when cured, is in excess of 100 psi, more typically in excess of 200 psi, after 72 hours at 130°F.

Un mélange à ciment pour la cimentation de tubage de puits dans un puits de forage qui contient un mélange synergétique d'un métasilicate alcalin et/ou d'un silicate alcalin, d'un silicate d'aluminium et soit d'une fumée de silice ou d'un quartz de silice microscopique avec un ciment Portland. Le mélange de ciment, s'il est combiné avec l'eau de mélange, peut produire un coulis cimentaire d'une densité inférieure ou égale à 11,5 livres par gallon; la quantité de l'eau de mélange dans le coulis cimentaire étant environ entre 200 et 560 en pourcentage en poids de ciment. La résistance à la compression de ces coulis cimentaires, s'ils sont durces, est supérieure à 100 livres par pouce carré, généralement supérieure à 200 livres par pouce carré, après 72 heures à 130 degrés F.

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