Patent ID: 8813843

Claim:
A method for treating a zone of subterranean formation, the method comprising the steps of: (a) forming a treatment fluid comprising: (i) water; (ii) a viscosity-increasing agent selected from the group consisting of a carboxyalkyl derivative of guar, a carboxyalkyl derivative of cellulose, and any combination of the foregoing; (iii) a crosslinker for the viscosity-increasing agent; (iv) a hydrophobically modified water-soluble polymer, wherein the hydrophobically modified water-soluble polymer is: (a) a reaction product of a hydrophilic polymer and a hydrophobic compound; or (b) prepared from a polymerization reaction of at least one hydrophilic monomer and at least one hydrophobically modified hydrophilic monomer; and wherein the viscosity-increasing agent is not a hydrophobically modified polymer, and (b) introducing the treatment fluid into a zone of a subterranean formation, wherein the zone has a design temperature of equal to or greater than 350° F.