Laboratory evaluation of an innovative polyfraction nanoemulsion for enhanced oil recovery in carbonate reservoirs

Polymers and nanoemulsions are frequently employed to boost enhanced oil recovery (EOR) systems' performance. Several physical phenomena that are essential to the process can be used in a synergistic way when both of these additives are used. Laboratory core flooding investigations utilizing natural cores are one way to evaluate these processes. Carbonate rocks are displaced by oil under extreme heat and pressure in a variety of studies. Tests are conducted on polymer solutions and a recently created polyfraction nanoemulsion. The test findings show that these compounds are stable at high temperatures, high pressures, and in the presence of H₂S, and they are useful for EOR operations. In the laboratory EOR simulation, the best results were obtained for polymer and nanoemulsion concentrations in diluted reservoir water of 0.05 % and 1 %, respectively. These concentrations were shown to be the most effective. The polymers continue to demonstrate a high level of effectiveness when it comes to the displacement of crude oil from carbonate rocks under these conditions. On the other hand, the nanoemulsion that was tested enhances the wettability of carbonate rocks and reduces interfacial tension, both of which are factors that promote the efficiency of oil displacement. When compared to the quantity that was accomplished with water that did not contain any additives, the oil recovery that was measured in this instance was 37.5 % higher.