Reservoir rock wettability is one of the key factors in fluid flow behavior an‎d reservoir efficiency. In this study, with the aim of improving the wettability properties, the metal-organic framework UiO-66 an‎d its modified composite with NiFe2O4 were used as a novel nanocrystalline material. First, UiO-66 was synthesized by hydrothermal method an‎d then a coating layer of it was applied to the surface of reservoir rock samples. To improve the hydro‎philicity an‎d increase the stability of NiFe2O4 nanoparticles, UiO-66@NiFe2O4 nanoparticles were added to the UiO-66 structure an‎d UiO-66@NiFe2O4 nanoparticles were also synthesized. The samples were characterized using XRD, FTIR, FEFE-SEM an‎d EDX analyses. The results of contact angle analysis showed that both coatings led to a significant reduction in contact angle an‎d change in wettability. The contact angle of the samples changed by 19, 34, 38, 35 an‎d 36 percent compared to the initial state when using UiO-66 nanoparticles, respectively. After modification of UiO-66, the core samples changed by 37, 32, 46, 42 an‎d 35 percent compared to the initial state, respectively. The surface wettability of all samples after saturation was more than 90 degrees an‎d oleophilic. Most of these samples were modified after using UiO-66 nanoparticles an‎d changed from oleophilic to hydro‎philic, an‎d after using UiO-66@NiFe2O4, all samples became completely hydro‎philic. Also, the Ammott test was investigated to determine the amount of oil produced from the core with distilled water, UiO-66 an‎d UiO-66@NiFe2O4 fluids, respectively. In this test, the amount of oil produced in the presence of UiO-66@NiFe2O4 was schematically the highest amount of oil produced. These findings indicate that the use of UiO-66, especially the UiO-66@NiFe2O4 composite, can be a new approach to improve the wettability of reservoir rocks an‎d increase productivity an‎d production in reservoirs.

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محسن محمدي , سهيل ضرغامي