Cement compositions comprising latex and a nano-particle

A cement composition comprising:

• cement;
• nano-silica in an amount of about 0.01% to about 1.5% by weight of the cement, wherein the nano-silica has a particle size range of about 5 nanometers to about 20 nanometers;
• an aqueous rubber latex in an amount of about 5% to about 20% by weight of the cement;
• a latex stabilizer in an amount of about 10% to about 20% by weight of the latex, wherein the latex stabilizer comprises a material selected from the group consisting of a sulfonate and a sulfate;
• and
• water in an amount of about 35% to about 70% by weight of the cement,
• wherein the cement composition has a density of about 8 pounds per gallon to about 17 pounds per gallon, and
• wherein the nano-silica is not colloidal and is essentially free of silica fume.