Recently, smart water (SmW) and nanocomposite (NC) fooding have shown good potential for enhanced oil recovery (EOR) processes. Although SmW and NCs are found to infuence the oil recovery, there are still some controversies regarding their performance on wettability alteration (WA). To address this important question, we synthesized new NC materials with high hydrophilic properties. In this research, in the frst stage, a NC was synthesized. The obtained compound was known as (UiO-66-NH2/TiO2/ZnO) (UNTZ). For the identifcation of NC, scanning electron microscopy (SEM), Brunauer–Emmett– Teller (BET), Fourier transform infrared spectroscopy (FTIR), and X-ray Difraction (XRD) techniques were used. Further- more, zeta-potential analysis was done to investigate the stability of nanofuids (NFs). To investigate the efect of NFs on oil recovery, 8 concentrations (1600, 1400, 1200, 900, 700, 500, 300, and 100 ppm) of UNTZ nanofuids were prepared. In the current work, to investigate the efectiveness of the combination of SmW (sulfate (SO4 2−) and calcium (Ca2+)) + NCs, tests such as interfacial tension (IFT), contact angle, and corefooding were used. The results of contact angle tests showed improved SmWs capabilities in the presence of NCs that a very efective reduction was accessible and highly hydrophilic wettability was obtained when using SmWs with stable NC as a minimum contact angle of 28° was achieved. The fndings of the corefood experiment indicated that at SmW(SmW2sulfate) + 100 ppm NC and SmW(SmW2calcium) + 100 ppm NC concentrations, the NF enhanced the oil recovery by 9.8 and 5.9%, respectively. This research ofers new fndings that can help oil recovery by understanding smart water technology with nanoparticle (NPs) in reservoirs (carbonate).
