Cement composition for lost circulation application and method of cementing

A well cement composition comprising:

• an aqueous base fluid;
• solid materials comprising:
• a microtine cement;
• nanoparticles comprising nano-silica;
• a synthetic clay;
• and
• a thixotropic modifier, wherein the thixotropic modifier is selected from sodium silicate, silicic acid, and combinations thereof, wherein the thixotropic modifier is present in an amount of about 0.1% to about 5% by weight of a cementitious material.

A wellbore cementing system comprising:

• a mixing apparatus;
• an aqueous base fluid;
• and
• solid materials comprising
• a microtine cement;
• nanoparticles comprising nano-silica;
• a synthetic clay;
• and
• a thixotropic modifier, wherein the thixotropic modifier is selected from sodium silicate, silicic acid, and combinations thereof, wherein the thixotropic modifier is present in an amount of about 0.1% to about 5% by weight of a cementitious material;
• a conduit connected to a wellbore;
• a pump connected to the mixing apparatus and the conduit.