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چکیده
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Utilizing nanoparticles in enhanced oil recovery (EOR) procedures is a very efficient way to modify key mechanisms in porous media, including contact angle and interfacial tension. In the current experimental study, a well-known CuO/Fe3O4/Xanthan nanocomposite (NCs) was combined with two naturally-origin nanoparticles, i.e., eucalyptus plant (EP-NCs) and walnut shell (WS-NCs). The main novelty of current study is obtaining an optimum concentrations for NCs, EP-NCs, and WS-NCs based on contact angle, and eta potential tests. Scanning electron microscopy, Fourier-transform infrared spectroscopy, energy diffraction X-rays, and Brunauer-Emmett-Teller tests have been performed on the fabricated nanocomposites to investigate their surface morphology and chemical compositions. The results show that the synthesized nanocomposites have the average diameters of NCs, EP-NCs, and WS-NCs of 31-59 nm, 15-101 nm, and 21-52 nm, respectively. Various tests, including wettability alteration, interfacial tension, zeta potential, and oil recovery, were conducted at 2000 psi and 70 °C to determine the best green nanocomposite and its optimum concentration for application in the carbonate porous media. The most stable zeta potential of -23.88 to -33.65 mV and the most considerable decrease in contact angle (i.e., 76.10 ° to 43.98 °) have been achieved by the optimum concentration of the EP-NCs and WS-NCs (i.e., 30 ppm). Comparing the performance of the three investigated nanocomposites in reducing wettability and interfacial tension and increasing stability proves that the EP-NC performed better than the NCs and WS-NCs. In addition, the displacement efficiency oil recovery factor obtained by NCs, WS-NCs, and EP-NCs is 36.00, 51.78, and 60.61% at 30 ppm, 70 °C, and 2000 psi, respectively.
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