#TITLE_ALTERNATIVE#

• Main Author: ANDHIKA (NIM:12213070), LUTFI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22936
• Institution: Institut Teknologi Bandung

Significant portion of CO2 is dissolved in reservoir brine during CO2-Enhanced Oil Recovery. Dissolved CO2 forms an acidic environment which could modify rock-fluid interaction. One of phenomenon that could happen due to this interaction is alteration of wettability during CO2 injection. <br /> <br /> <br /> <br /> The observation of this phenomenon was exhibited by measuring contact angle of drop of several buffer solutions on thin section of sandstone sample. The use of the solution was meant to approach product of CO2 solubility in water that could occur in reservoir condition, evaluated by Henry constant. Thus, the result of the measurement was simulated in an inverted 5-spot injection model. This was conducted to evaluate the effect altered wettability in oil recovery performance according to experimental result. The simulation scenarios, applying in the model, were water injection, water + CO2 injection without employing the effect, and water + CO2 employed with the effect. <br /> <br /> <br /> <br /> Interpretation of contact angle test indicated that lowering the pH value of buffer solution induced wetting phase of rock to become more water wet. This was because a great amount of H+ ion that was contained in lower pH. The ion will make the fluid to more disperse on to surface of the rock as surface charge of sandstone, generally, was a negative charge. Furthermore, the running of simulation showed that scenario of injecting CO2, equipped with the wettability alteration, resulted in a slightly increase in oil recovery compared to other cases. This was happened as the alteration of wettability will change the relative permeability, thus reducing residual oil of the model. Thus, the slightly increase was attributed to previous characteristic of either modeled formation in simulation or formation in experimental study that was a water wet also. <br /> <br /> <br /> <br /> This study presents that the dissolved CO2 in water/brine could contribute to oil recovery in CO2 injection in term of wettability alteration.