Patent ID: 7378378

Claim:
An oilfield method for hydraulic fracturing, gravel packing or hydraulic fracturing and gravel packing comprising: a. viscosifying a fluid with a viscoelastic surfactant system comprising a viscoelastic surfactant selected from at least one of zwitterionic, amphoteric, and cationic surfactants and mixtures thereof, said fluid having an entangled micelle structure capable of rehealing after shear, b. adding to said fluid a rheology enhancer package increasing the viscosity of said fluid and decreasing the time of shear rehealing of said fluid to less than 15 seconds, said rheology enhancer package comprising from about 0.005 weight percent to about 0.5 weight percent of a first component comprising a block copolymer of polypropylene glycol and polyethylene glycol and from about 0.005 weight percent to about 0.5 weight percent of a second component comprising a polynaphthalene sulfonate, and c. injecting said fluid down a well.