Application of Nanofluids and Nanocomposites for Enhanced Oil Recovery
- The low recovery of oil (only one-third) is mainly related to the displacement efficiency of porous media, which is influenced by wettability and interfacial tension. Since a large amount of oil deposits, two third of the original oil-in-place is trapped by the capillary forces, and there is a need to recover residual oil by improving oil recovery techniques. Although gas, thermal, microbial, and chemical injection is very popular and highly used techniques, they have some disadvantages. Therefore, tertiary oil recovery techniques, such as the application of nanofluids and nanocomposites, may solve this problem. The selection of appropriate techniques depends on the reservoir and economics. The mobility ratio and the mechanisms for nano-enhanced oil recovery have also been explained. Silica, zinc oxide, titanium dioxide, carbon-based nanoparticles, graphene quantum dots, graphene oxide nanosheets, and anionic surfactants are widely used in enhanced oil recovery research. Nanocomposites were discussed recently prepared, including potassium chloride/silicon dioxide/xanthan and zinc oxide/silicon dioxide/xanthan nanocomposite and others. The reviewed literature experimental data has shown that it is possible to increase the enhanced oil recovery in the 10 to 79% range depending on the applied nanofluid or nanocomposite.