Single blended cement system for use at wide ranges of density and temperatures

A method of cementing a wellbore penetrating a subterranean formation, the method comprising:

• blending a base cement slurry with one or more liquid additives to provide a cementing composition,
• the base cement slurry comprising
• a liquid carrier;
• a class G cement or a combination of a class G and class C cements;
• silica fume, or fumed silica, or a combination of silica fume and fumed silica,
• the base cement slurry having a density of 14 to 16 ppg;
• and
• injecting the cementing composition into the wellbore;
• wherein the one or more liquid additives comprise a light weight liquid additive comprising (1) about 30 to about 50 wt % of a glass sphere, (2) about 0.5 to about 2 wt % of a diutan gum, and (3) water by weight of the water in the light weight liquid additive, the liquid weight liquid additive having a density of 5 to 7.

A method of cementing a wellbore penetrating a subterranean formation, the method comprising:

• blending a base cement slurry with one or more liquid additives to provide a cementing composition,
• the base cement slurry comprising
• a liquid carrier;
• a class G cement or a combination of a class G and class C cements;
• about 1 to about 10 wt % of kaolinite clay,
• about 3 to 7 wt % of silica fume, or fumed silica, or a combination of silica fume and fumed silica,
• the base cement slurry having a density of 14 to 16 ppg;
• and
• injecting the cementing composition into the wellbore,
• wherein the one or more liquid additives comprise a silica suspension liquid additive which comprises (1) 20 to 40 wt % of silica flour, (2) 20 to 40 wt % of silica sand, (3) a diutan gum, and (4) 20 to 40 wt % % water each based on the total weight of the silica suspension liquid additive.