To test the IFT of fluids with crude oil, we conducted this test between oil and the previously mentioned fluids. The interfacial tension between oil and the solutions was determined by the axisymmetric drop shape analysis using the pendant drop method (Ramé-hart advanced goniometer 500-F1). The oil drop (crude oil) was immersed in the surfactant solution by a precise syringe. The interfacial tension between oil and water was measured as soon as the oil droplet was formed. The interfacial tension values were obtained using the Young-Laplace equation. The results of the IFT are shown in Fig. . As can be noticed from Fig. , as the salinity of the mixed water with foam decreases, the resulting IFT decreased too. As can be noticed from all the tests carried out in this study, reservoir core 47, which were flooded with fifty times diluted seawater and foam, is showing the best results among other reservoir cores. The interfacial tension was the lowest among the other cores. The contact angle was the lowest too, before and after core flooding. Besides, the ultimate and improved oil recovery was the highest, which was 72.77% of the OOIP. The effect of salinity is playing a significant role in altering sandstone wettability towards being more water-wet, and it enhances the efficiency of foam as well. As the salinity decrease, interfacial and contact angle decreases too, and in turn, oil recovery increases.