TINJAUAN KEBERHASILAN MICROBUBBLE UNTUK CO2 FLOODING PADA LAPANGAN R DENGAN SIMULASI RESERVOIR

• Main Author: Ismail, Nauval
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/50533
• Institution: Institut Teknologi Bandung

CO2 as an injection fluid is quite effective in enhancing oil recovery because it can lower the interfacial tension resulting in a miscible condition. However, most of the oil and gas field in Indonesia is an old field with very low pressure so it is so difficult to achieve the miscible condition. Based on laboratory test, the use of microbubble CO2 technology as an injection fluid could increase the sweep efficiency and accelerate CO2 dissolution in immiscible condition. The mechanism of microbubble CO2 injection is reviewed by altering the PVT parameters referring to reference data form previous laboratory studies. By matching the graph of CO2 saturation vs Pore Volume injection and the ratio of decrease from CO2 vs time between simulation and lab result, show that the parachor and acentric factor parameters presumed to be responsible for the mechanism of microbubble flooding. This study discusses the microbubble CO2 injection effect in field-scale reservoir through the investigation in oil properties modification and also determines parameters that affect microbubble CO2 injection towards oil cumulative production increase. Field-scale reservoir simulation is done with the injection flooding method using an inverted five-spots pattern. With this method the microbubble CO2 injection increase the recovery factor by 3.68% from normal bubble CO2 injection. Sensitivity analyses were done to observe the effect of operational parameters on the performance of the reservoir model. Based on the sensitivity analysis, for gas rate injection sensitivity, the recovery factor value from 1000 Mscf/d to 10000 Mscf/d is increasing 1.2%; for API gravity sensitivity, the recovery factor value from 20° API to 50° API is increasing 1.4%; for pattern area sensitivity, the recovery factor value from 25 acres to 75 acres is increasing 1.58%. Based on the calculation of Minimum Miscibility Pressure (MMP) at reservoir fluid from field R, the injection of microbubble CO2 can reduce the MMP up to 830 psi.