Effect of Saline Concentration on Oil Recovery
The effect of saline concentration on the OR is shown in Fig. 2. The OR was 97.73% when water was added without the addition of salt. It gradually decreased as the saline concentration was increased from 0% to 10%. Therefore, the addition of salt adversely affected the OR. The reason for obtaining this result is unknown. Salt may compete with hydrophilic compounds for water so that their hydration is not enough for releasing oils.