Patent ID: 8173581

Claim:
A method for treating a subterranean formation comprising: injecting an aqueous viscoelastic surfactant treating fluid through a wellbore to the subterranean formation, where the aqueous viscoelastic surfactant treating fluid comprises: an aqueous base fluid; a viscoelastic surfactant (VES) gelling agent in an amount effective to increase the viscosity of the aqueous viscoelastic surfactant treating fluid; and an amount of a solid, particulate dicarboxylic acid agent sufficient to have an effect selected from the group consisting of: improving the fluid loss of the aqueous viscoelastic treating fluid, and further increasing the viscosity of the aqueous viscoelastic surfactant treating fluid, as compared with an identical fluid absent the agent, where the solid, particulate dicarboxylic acid agent is insoluble in aqueous liquids and hydrocarbon liquids, but is soluble in mutual solvents and/or blends of at least two alcohols, and where the solid, particulate dicarboxylic acid agent has a formula molecular weight of from 146 to 400, where the aqueous base fluid, the VES gelling agent and the solid, particulate dicarboxylic acid agent were added together to form the aqueous viscoelastic surfactant treating fluid prior to injecting; and treating the subterranean formation wherein the treating the subterranean formation is done concurrently with or after the injecting an aqueous viscoelastic surfactant treating fluid.