Patent ID: 7287593

Claim:
A method of fracturing a subterranean formation comprising: preparing a treatment fluid composition comprising an aqueous medium, a carboxy modified polymer, and a crosslinking agent; adding a viscosity enhancing amount of quaternary amine salt to the treatment fluid, wherein the quaternary amine salt is selected from the group consisting of benzyldimethylcocoalkyl ammonium chloride, benzylbis(2-hydroxyethyl)cocoalkyl ammonium chloride, alkyl (C12-16) dimethyl benzyl ammonium chloride, coco benzyl ammonium chloride ethoxylate, and any mixtures thereof, provided the fluid does not comprise a viscoelastic surfactant; and, introducing the combination of the quaternary amine salt and the treatment fluid composition into a subterranean formation to fracture the formation.