Methods and cement compositions for cementing in subterranean zones

A cement composition comprising:

• a hydraulic cement;
• sufficient water to form a slurry;
• an additive comprised of carboxymethylhydroxyethyl cellulose (CMHEC) present in the cement composition in an amount in the range of from about 0.1% to about 2.5% by weight of the hydraulic cement therein and having in the range of from about 0.62 to about 2.21 moles of hydroxyethyl substitution and in the range of from about 0.44 to about 0.52 degrees of carboxymethyl substitution, and a 2% by weight aqueous solution of the CMHEC has a Hoppler viscosity in the range of from about 55 mPa.s to about 359 mPa.s;
• sufficient gas to foam said slurry;
• and
• a sufficient amount of a foaming and foam stabilizing surfactant mixture comprising an ethoxylated alcohol ether sulfate;
• cocoylamidopropyl betaine, and cocoylamidopropyl dimethyl amine oxide to facilitate the formation of and stabilize the foam.

A cement composition comprising:

• a hydraulic cement selected from the group consisting of a Portland cement, a slag cement, a pozzolana cement, a gypsum cement, an aluminous cement and an alkaline cement;
• sufficient water to form a slurry;
• an additive comprised of carboxymethylhydroxyethyl cellulose (CMHEC) having in the range of from about 0.62 to about 2.21 moles of hydroxyethyl substitution and in the range of from about 0.44 to about 0.52 degrees of carboxymethyl substitution, and a 2% by weight aqueous solution of the CMHEC has a Hoppler viscosity in the range of from about 55 mPa.s to about 359 mPa.s;
• sufficient gas selected from the group consisting of air and nitrogen to foam said slurry;
• and
• a foaming and foam stabilizing surfactant mixture comprising an ethoxylated alcohol ether sulfate;
• cocoylamidopropyl betaine, and cocoylamidopropyl dimethyl amine oxide.