Capillary desaturation curve: does low salinity surfactant flooding significantly reduce the residual oil saturation?

Abstract Different oil displacement experiments conducted on sandstone and carbonate samples show that low salinity water (LSW) injection can reduce the residual saturation (ROS). Recently, surfactant flooding (SF) in combination with (known as (LSS) flooding) is proposed a potentially promising hybrid enhanced recovery (EOR) process. A lower ROS reported for LSS process compared to seen SF or LSW at same capillary number. The desaturation curve (CDC) well-known tool study effect of viscous forces different EOR techniques. In this study, data various LSW, SF, numbers are collected develop CDC analyze performance method. This help method an extra improvement sweep efficiency reduction oil. observed number range. Our shows behaviors ranges numbers. Three regions identified based values. difference not significant first region (capillary range 10 ?7 –10 ?5 ), which applicable presence due interfacial tension value. second ?2 ) SF. most practical flooding. Hence, application provides noticeable benefit normal third greater than where better performer, negligible.