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چکیده
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Chemical Enhanced Oil Recovery (CEOR) flooding is considered as one of the most effective techniques for extracting trapped oil from porous media. The use of nano-particles in EOR processes significantly aids in reducing interfacial tension (IFT) and modifying the wettability of reservoir rocks. In this regard, a blend of various nano-composites (NCs) yields better results than a single material, improving surface or interfacial properties. In this research, a new NC with low salinity (LoSal) water/engineered water was utilized as the base fluid to create smart one. Synthetic NC consisting of titanium dioxide (TiO2), silica (SiO2), and Tween 20. In this regard, the synthesized NC was examined using various structural analyses, including EDX, XRD, FT-IR, and FESEM. To assess the effectiveness of the smart nano-fluid, a series of tests were conducted, including Zeta (ζ) potential, electrical conductivity, contact angle measurements, IFT assessments, core flooding experiments, and micromodel tests. Findings indicated that the smart nano-fluid mixture exhibited a superior synergistic effect, achieving a minimum IFT of 3.03 mN/m at a concentration of 500 ppm. The contact angle measurements revealed a shift in rock wettability from oil-wet (OW) to water-wet (WW), decreasing from 159° to 30°. Additionally, the results showed that core flooding with the nano-fluid improves oil recovery by 29%. Also, the micromodel tests demonstrated a maximum oil recovery increase of 34% with the nano-fluid compared to LoSal water.
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