PROCESS TO COMBAT LOST CIRCULATION IN A AREA DURING THE CEMENTATION OF OIL, GAS AND WATER CEMENTS AND THIXOTROPIC CEMENT COMPOSITION TO BE USED IN COMBATING LOST CIRCULATION

摘要

A thixotropic cement composition for cementing subterranean wells comprises water, hydraulic cement, a titanium chelate crosslinking agent, and one or more crosslinkable resins selected from water-soluble cellulose ethers; polyvinyl alcohol; homopolymers, copolymers and terpolymers of AMPS (2-arylamido - 2-methylpropane sulfonic acid), sodium vinylsulfonate, acrylamide, N,N dimethylacrylamide and acrylic acid. The cement slurry quickly forms a high static gel strength and is thus useful for cementing under pressure. It is also useful for combatting lost circulation in a zone.