Abstract
Salt-resistant, heat-resistant, and viscoelastic properties are critical for fluids used in oil fields, and one approach of producing these high- performance fluids is to use a mixture of different surfactants. Herein, we present a detailed study on the development of a mixture fluid consisting of two different sulfobetaine-type zwitterionic Gemini surfactants: EDABS and EDAES. Different molar ratio mixtures were evaluated in terms of the surface tension, salt-resistance and particle size distribution of the mixture. The BES-3 fluid, consisting of EDABS and EDAES with the molar ratio of 1 to 1, has the best salt-resistance, due to their strong interactions. The BES-3 fluid exhibited superior viscoelasticity, shear-tolerance, and temperature-tolerance as a result of the strong network structures formed by entangled wormlike micelles of the interacted surfactants in solution. Therefore, these exciting results show strong potential for the BES-3 fluid to be employed as rheological modifier in fracturing fluid and oil-displacing agents.
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