Visco-elastic Properties of VES Diverting Acid for Carbonate Reservoirs

Storage modulus and loss modulus is the main performance index of visco-elastic properties. In this paper the storage modulus and loss modulus of a new diverting acid and their influencing factors were systematically investigated. Besides, the constitutive equations of the diverting acid at different temperatures were elicited from shearing experiments, which show that the visco-elastic surfactant (VES) acid system is a non-Newtonian power law fluid at low temperature and a Newtonian fluid at high temperature. The storage modulus and loss modulus at different temperatures, pH, and VES content in the acid are critical for the design of acid stimulation for oil well, especially when the VES acid is used in this field only on trial and the basic data are in urgent needed for the design and construction of the acidification stimulation.