the present invention generally relates to a method for treating a subterranean formation with an aqueous viscoelastic treating fluid that an aqueous base fluid and one or more non - ionic amido amine oxide surfactant gelling agents . the treatment method comprises injecting the aqueous viscoelastic surfactant treating fluid through a wellbore and into the subterranean formation under conditions effective to control fluid loss , and breaking the gel of the aqueous viscoelastic treating fluid subsequent to treating said formation .