  Long-chained surfactant solutions have found widespread use in the oil and
gas industry due to a host of attractive properties. In this paper, we
characterize one such commercially used viscoelastic surfactant that forms a
wormlike micellar gel at room temperature and a viscoelastic solution at higher
temperatures. We probe both states by conducting linear and nonlinear
rheological tests and analyze their behaviour under the framework of micellar
rheology. Our study outlines departure from behaviour exhibited by more
conventional micellar systems and uncovers interesting dynamics like
shear-induced fracture and possible shear-banding in these materials. In doing
so we provide a detailed understanding of a novel class of wormlike micellar
solutions
