Analysis of correlation between interfacial tension and salinity in sodium lignosulfonate surfactant

Abstract

The use of surfactants is increasing to be injected into the reservoir in the process of enhanced oil recovery. This encourages the creation of environmentally friendly surfactants based on relatively cheaper price, and is easily available. One of the alternatives is to use sodium lignosulfonate based on sugarcane bagasse. The surfactant injection process in EOR is very dependent on the value of interfacial tension (IFT) when mixed with oil. The smaller the value of IFT, the surfactant tends to be chosen for use in the field. Another surfactant screening parameter is salinity. Changes in salinity can affect the value of the IFT . The materials used in this study consisted of: bagasse surfactant, crude oil, and synthetic salt water in various salinity. The parameter studied is the surfactant solution interface stresses at different salinity. The author then examines the change in the value of the interface voltage to salinity at each concentration of the solution. IFT values tend to decrease to the lowest point due to surfactant molecules gradually moving from salt water to oil at low salinity, then IFT will increase with increasing salinity due to the majority of surfactant molecules present in the oil and the adsorption balance.