Patent ID: 7967909

Claim:
A method of cementing within a gas or oil well penetrating a subterranean formation, the method comprising the steps of: pumping into the well a cementitious slurry comprising water and a cement mix, wherein the cement mix comprises: (a) a hydraulically-active cementitious material; (b) between from about 0.1 to about 8 weight percent, by weight of cementitious material (BWOC), of an alkali metasilicate and/or alkali silicate; (c) between from about 2 to about 10 percent BWOC of calcined kaolin or metakaolin; and (d) between from about 0.5 to about 55 percent BWOC of silica fume or micro silica quartz; and allowing the cementitious slurry to set.