Zivar, DavoodPourafshary, PeymanMoradpour, Nikoo2021-09-052021-09-052021-01-02Zivar, D., Pourafshary, P. & Moradpour, N. Capillary desaturation curve: does low salinity surfactant flooding significantly reduce the residual oil saturation?. J Petrol Explor Prod Technol 11, 783–794 (2021). https://doi.org/10.1007/s13202-020-01074-1http://nur.nu.edu.kz/handle/123456789/5739Different oil displacement experiments conducted on sandstone and carbonate samples show that low salinity water (LSW) injection can reduce the residual oil saturation (ROS). Recently, surfactant flooding (SF) in combination with low salinity water (known as low salinity surfactant (LSS) flooding) is proposed as a potentially promising hybrid enhanced oil recovery (EOR) process. A lower ROS is reported for a LSS process compared to that seen in SF or with LSW at the same capillary number. The capillary desaturation curve (CDC) is a well-known tool to study the effect of viscous and capillary forces on ROS for different EOR techniques. In this study, ROS data of various LSW, SF, and LSS flooding experiments at different capillary numbers are collected to develop a CDC to analyze the performance of the hybrid LSS method. This can help to analyze the effect of the hybrid method on an extra improvement in sweep efficiency and reduction in residual oil. A lower ROS is observed for LSS compared to LSW and SF in the same capillary number range.enAttribution-NonCommercial-ShareAlike 3.0 United StatesArticle