Patent ID: 8741818

Claim:
A lost circulation composition comprising: hydraulic cement in an amount of about 0.1% to about 25% by weight of the lost circulation composition; nano-particles having a particle size in a range from about 1 nanometer to about 100 nanometers and present in an amount of about 0.1% to about 10% by weight of the lost circulation composition, wherein the nano-particles comprise nano-particles selected from the group consisting of colloidal nano-silica, nano-alumina, nano-zinc oxide, nano-boron, nano-iron oxide, nano-calcium carbonate, and any combination thereof; amorphous silica in an amount of about 0.1% to about 15% by weight of the lost circulation composition; a nano-clay having a particle size in a range of from about 1 nanometer to about 100 nanometers and present in an amount of about 0.1% to about 2% by weight of the lost circulation composition; and water in an amount of about 60% to about 80% by weight of the lost circulation composition; wherein the lost circulation composition has a 10-second static gel strength of at least about 15 lbf/100 ft 2 at room temperature, wherein the lost circulation composition has a 10-minute static gel strength of at least about 25 lbf/100 ft 2 at room temperature, wherein the lost circulation composition is a sealing composition that prevents the migration of fluids.