THE ADSORPTION, WETTABILITY, AND CORE FLOODING RECOVERY ANALYSIS OF SURFACTANT SODIUM LIGNOSULFONAT INJECTION DERIVED FROM BAGASSE ON SANDSTONE CORE TOWARD LABORATORY EXPERIMENT AND SIMULATION RESULTS

• Main Author: BUDHI PRASETYO (NIM: 22215016), ANTONI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/21162
• Institution: Institut Teknologi Bandung

Surfactant flooding is one of enhanced oil recovery or EOR methods. This research used surfactant sodium lignosulfonate or SLS which is synthesized from bagasse, as an alternative surfactant for EOR applications. Surfactant used in EOR process needs to be analyzed interms of its ability in increasing recovery factor such as using adsorption and wettability test. The purpose of this research is to analyze the effect of salinity and surfactant concentration variation on adsorption and wettability, and to obtain total recovery factor using surfactant flooding simulation method. <br /> <br /> <br /> For adsorption and wettability test, we used different concentrations of salt (5000-80000 ppm) and different surfactant concentrations (1% - 5%). Surfactant flooding simulation was done by matching model to the previous experiment result and forecasting the total recovery factor value using CMG STARS software. <br /> <br /> <br /> Based on the results, salinity and surfactant concentration affect the adsorption and wettability of surfactant. Adsorption value increase with the increase of surfactant concentration. This is due to the increment of surfactant concentration will increase number of surfactant attached to the rock. At low salinity, the adsorption value increases with the increase of salinity due to ion salt reduce repulsion forces between surfactants and rock. At high salinity, the adsorption value slightly decrease due to the interaction between water and ion salt (salt out) which increase repulsion forces between the surfactant and the rock. The lowest adsorption value is 459.30 mg/mL at salinity 5000 ppm and surfactant concentration 1.5%. In wettability test, contact angle between water and solid decrease with the increase of surfactant concentration. This is due to ion salt reduce repulsion forces between surfactants and rock, thus surfactant can increase adhesion forces of water. At low salinity contact angle is low. This is due to ion salt interact with surfactant, thus, adhesion forces of water still larger than cohesion forces. On the otherhand, At high salinity contact angle is high, due to ion salt interact with water, thus, cohesion forces of water is larger than adhesion forces. The lowest contact angle value is 18.430 at salinity 10000 ppm and 5% surfactant concentration. Surfactant flooding simulation shows that highest total recovery factor is 34.32% has reached at salinity 10000 ppm and surfactant concentration of 3%. Meanwhile, highest total recovery factor is 28.67% at salinity 20000 ppm and surfactant concentration of 4%.