Perpustakaan Digital ITB

Surfactant flooding has been known to increase ultimate recovery factor by reducing interfacial tension (IFT) of oil-water. Ultra-low IFT (10e-3 mN/m) needs to be maintained in a reservoir to effectively reduce oil residual saturation and improve oil recovery. One way to determine the interfacial tension is by using a spinning-drop tensiometer. However, this procedure is costly and time-consuming if one wants to measure the IFT at various salinity and various surfactant candidates. Surfactant screening before determining IFT with a tensiometer is preferable as the number of candidates has been reduced and the range of optimum salinity has been optimum. One of the surfactant screening processes is salinity scan or phase behavior test. A salinity scan can determine the range of optimum salinity of the surfactant-brine-oil system which gives the lowest IFT. However, optimum salinity only cannot determine which surfactant gives the better result. Utilizing Huh equation, one can determine the IFT based on the solubilization ratio. This method recommends surfactant SAE as it can achieve the highest solubilization ratio. However, this result is not aligned with lab measurements that recommend surfactant FEO. Some constant modification is applied to Huh equation and the result is similar to lab measurement. In this study, we also explore the possibility to improve the Huh equation by utilizing salinity as a variable.