Perpustakaan Digital ITB

Waterflooding, as the most commonly used secondary oil recovery method, can lead to viscous fingering and channeling effects, resulting in poor sweep efficiency. The addition of polymers as a thickening agent to the injection water can enhance the mobility of the driving fluid and improve sweep efficiency, thereby reducing residual oil saturation (Sor). In this study, the effects of various parameters, including heterogeneity and mobility ratio, on oil recovery factors were investigated. In this research, a series of polymer injection experiments were conducted using glass-type micromodels. These micromodels were designed with heterogeneous flow patterns, with injection ports positioned parallel to the flow direction in the medium zone. The micromodels were saturated with light crude oil samples from the Kendali Asam field before starting the injection. The polymer used in this study was FP3630s. The entire process was continuously photographed with a high-resolution camera to monitor the displacement of the polymer solution in the micromodel, and the images were analyzed using digital image analysis. Experiments were conducted through four scenarios, and the results showed that reservoir heterogeneity impacted channeling, and under poor mobility conditions, this led to viscous fingering. Polymer injection was proven to reduce the occurrence of channeling and viscous fingering. Within the range of mobility ratio values (M?1), injection was performed on the micromodel up to 7 pore volumes, and the results showed that the recovery factors were not significantly different. There was uncertainty in the laboratory experiments, with a standard deviation calculation yielding a value of 4.32%, indicating that the experiments would affect the oil recovery calculation with an error of 4.32% for each scenario.