Abstract
Thermal stability and rheological properties of a novel surfactant–polymer system containing non-ionic ethoxylated fluorocarbon surfactant was evaluated. A copolymer of acrylamide (AM) and 2-acrylamido-2-methylpropane sulfonic acid (AMPS) was used. Thermal stability and surfactant structural changes after aging at 100 °C were evaluated using TGA, 1H NMR, 13C NMR, 19F NMR and FTIR. The surfactant was compatible with AM–AMPS copolymer and synthetic sea water. No precipitation of surfactant was observed in sea water. The surfactant was found to be thermally stable at 100 °C and no structural changes were detected after exposure to this temperature. Rheological properties of the surfactant–polymer (SP) system were measured in a high pressure rheometer. The effects of surfactant concentration, temperature, polymer concentration and salinity on rheological properties were studied for several SP solutions. At low temperature (50 °C), the viscosity initially increased slightly with the addition of the surfactant, then decreased at high surfactant concentration. At a high temperature (90 °C), an increase in the viscosity with the increase in surfactant concentration was not observed. Overall, the influence of the fluorocarbon surfactant on the viscosity of SP system was weak particularly at high temperatures and high shear rate. Salts present in sea water reduced the viscosity of the polymer due to a charge shielding effect. However, the surfactant was found to be thermally stable in the presence of salts.
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Acknowledgments
This research was supported by Saudi Aramco through project # CPM 2297. The authors would like to thank King Fahd University of Petroleum & Minerals (KFUPM) for supporting this research. SNF and DuPont are also acknowledged for providing polymer and surfactant samples.
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Kamal, M.S., Sultan, A.S., Al-Mubaiyedh, U.A. et al. Evaluation of Rheological and Thermal Properties of a New Fluorocarbon Surfactant–Polymer System for EOR Applications in High-Temperature and High-Salinity Oil Reservoirs. J Surfact Deterg 17, 985–993 (2014). https://doi.org/10.1007/s11743-014-1600-7
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DOI: https://doi.org/10.1007/s11743-014-1600-7