Patent ID: 7825075

Claim:
An aqueous viscoelastic treating fluid comprising: an aqueous base fluid; a viscoelastic surfactant (VES) gelling agent; and a viscosity enhancer selected from the group consisting of berlinite (AlPO 4 ), lithium tantalate (LiTaO 3 ), gallium orthophosphate (GaPO 4 ), BaTiO 3 , SrTiO 3 , PbZrTiO 3 , KNbO 3 , LiNbO 3 , BiFeO 3 , sodium tungstate, Ba 2 NaNb 5 O 5 , Pb 2 KNb 5 O 15 , potassium sodium tartrate, tourmaline, topaz and mixtures thereof, where the viscosity enhancer has a particle size ranging from about 1 nanometer to about 2 microns.