چكيده به لاتين
Stability and hydrophilicity of TiO2 nano-coating was improved in this work. TiO2 nanoparticles were prepared via conventional, microwave radiation, surfactant, refrigerating, and silica-assisted sol-gel processes. The coated rock plates were obtained by impregnating the plates with nanofluids. The modified TiO2-based coatings shows to be more effective for wettability alteration purposes compared to the conventional TiO2 coating. The un-coated surface was superhydrophobic where the n-heptane and water droplets contact angles on the rock surface were 0° and 168° respectively. The n-heptane contact angle on the rock treated via conventional, microwave radiation, surfactant, refrigerating, and silica-assisted sol-gel synthesized nanoparticles changed to 128°, 159°, 156.8°, 151° and 163° respectively. While water contact angle was 53.5°, 0°, 24.1°, 28.6°, and 0° applying the above processes. This confirms that the superhydrophilic coatings were formed on a superhydrophobic surface. The fabricated nano-coatings exhibited high thermal, mechanical and salinity stability. The rock surface before and after treatment as well as the synthesized nanoparticles were characterized by SEM, XRD, and FTIR analyses. Moreover, the surface charge of the nanoparticles in the solution was evaluated using Zeta potential analysis. Results of this study indicate the possibility of using the materials for wettability alteration of oil-wet carbonate rock in enhanced oil recovery (EOR) process. The reresults of coreflooding tests demonstrate that the oil recovery enhanced significantly through the nanofluid flooding.
