Patent ID: 6887833

Claim:
A composition for temporarily sealing a subterranean zone to prevent the uncontrolled flow of fluids into or from the zone comprising: a first component comprising oil, wherein the balance of the composition comprises: a second component present in an amount in the range of from about 10% to about 90% by weight of the balance of the composition comprising a hydratable polymer, an organophilic clay, and a water-swellable clay, and a third component present in an amount in the range of from about 10% to about 90% by weight of the balance of the composition comprising an inorganic material that is readily acid soluble but substantially insoluble in neutral or basic water, wherein the water-swellable clay is present in an amount in the range of from about 84% to about 95% by weight of the second component and wherein the third component is no more than about 1% by weight soluble in de-ionized water when tested at a pH of about 7, a temperature of about 212Â° F., and a pressure of about 1 atmosphere.