EFFECT OF SURFACTANT CONCENTRATION AND NANOSILICA ADDITIVE TO RECOVERY FACTOR WITH SPONTANEOUS IMBIBITION TEST METHOD

Abstract

In an effort to improve oil recovery, there are several methods in a chemical that have been proven to be successfully applied, one of them which is the application of surfactants flooding. However, the effectiveness of the surfactant so limited to reach the broader reservoir zone as there is already considerable oil depleted in the primary and secondary recovery. So in this research used nanosilica additives as a solution to maximize the performance of surfactants to able the smaller pores and distant rocks to improve the oil recovery factor. The result can be known using the spontaneous imbibition test method. Laboratory research consisted of two main processes: manufacture of artificial core and spontaneous imbibition test. In the manufacture of artificial cores, cores are made by mixing quartz, cement and bentonite, with variations of additive nanosilicaa saturated on the artificial core. The spontaneous imbibition test was performed using brine 10000 ppm mixed with five different surfactant concentration from 0.1%, 0.25%, 0.5%, 0.75% until 1%. Based on the results of the research, it was found that core with the use of additive nanosilica with 0.5% surfactant concentration solution resulted in optimum recovery factor with 34.7% value compared to the core without nanosilica with RF of 31.8%. If the surfactant concentration to be added so recovery factor will continue to decrease.