CO2 Injection Scenarios for CCUS-EOR at The Oddball Field

Abstract

This research was conducted to provide a comprehensive analysis of the best scenario to be proposed for EOR at The Oddball Field. Incremental oil production, the amount of CO2 stored in the reservoir, the most contribute CO2 trapping mechanism, CO2 time breakthrough, and give a recommendation of the best scenario are the main objectives of this research. A numerical method through a compositional reservoir simulation was chosen for the completion of this research. Initially, historical matching is performed to confirm current reservoir conditions and estimate reserve volumes. Then, three different scenarios were proposed by the author, they are Continuous CO2 Injection (CO2 INJ CONT), Water Alternating Gas (WAG) and Simultaneous WAG (SWAG). The simulation starts on January 1, 2031, and ends on December 31, 2050 (20 years). The results show that the CO2 INJ CONT, WAG and SWAG scenarios respectively increase oil recovery by 24.35%, 23.35% and 20.41%. Then, the stored volume is 81.19, 44.47 and 46.09 MMTonne. The most contributing trapping mechanism is supercritical fluid. In addition, the time breakthrough occurs after 9 months of injection for CO2 INJ CONT and WAG scenarios. Lastly, the author recommends the scenario WAG to be proposed as the next field development strategy.