Evolution of CO2 Utilization Ratio and CO2 Storage under Different
CO2 - EOR Operating Strategies: A Case Study on SACROC Unit Permian Basin
- P. Hosseininoosheri (The University of Texas) | S. A. Hosseini (The University of Texas) | V. Nunez-Lopez (The University of Texas) | L. W. Lake (The University of Texas)
- Document ID
- Society of Petroleum Engineers
- SPE Western Regional Meeting, 22-26 April, Garden Grove, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 1.6 Drilling Operations, 5.5.8 History Matching, 5.2 Reservoir Fluid Dynamics, 5.4.2 Gas Injection Methods, 5.5 Reservoir Simulation, 5.4 Improved and Enhanced Recovery, 5 Reservoir Desciption & Dynamics, 5.4 Improved and Enhanced Recovery
- CO2 Storage, CO2 Utilization Ratio, SACROC, CO2 EOR, CO2â€“EOR Efficiency
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There are several parameters affecting the net and gross CO2 utilizations during a CO2-EOR process. Although many of the parameters cannot be changed for a specific hydrocarbon reservoir, the field development strategy is one of the parameters that could be chosen in a way to get the most favorable CO2 utilization ratios, oil production, and CO2 storage. This paper presents a field scale compositional reservoir fluid flow model in the SACROC (Scurry Area Canyon Reef Operators Committee) unit, Permian Basin. The model was developed to investigate the impact of various injection scenarios, such as CGI (Continuous Gas Injection) and WAG (Water Alternating Gas) on CO2 utilization ratio, oil production, and CO2 storage during CO2 injection. Additionally, we demonstrated the amount of stored CO2 in different phases: dissolved in brine, miscible in oil, residual CO2, and mobile CO2 and correlated the contribution of different trapping mechanisms to the utilization ratios. A high-resolution geocellular model, which was constructed based on wire-line logs, seismic surveys, core data, and stratigraphic interpretation, is used for numerical simulations. Previous studies skipped the history matching of the field; however, the initial distribution of fluids plays an important role in CO2–EOR efficiency. Therefore, a comprehensive history matching of primary, secondary, and tertiary recovery was conducted for this study. The history matching process included matching the average reservoir pressure, the oil and water production, and most importantly the gas production. The results show that the utilization ratio is not a constant number and evolves during the injection period. The results of this study also shows how the evolution of oil miscibility trapping over the injection time controls the evolution of net CO2 utilization ratios. CGI showed higher utilization ratios than WAG. We also compared both the total stored amount and the amount of stored CO2 in different phases. Finally, we compared the amount of produced oil for the assumed field development strategies. Results show that the amount of produced oil by WAG and CGI are so close. Among the various scenarios explored, WAG seems be a promising operational approach to balance both storage and oil production. The present work provides valuable insights for optimizing oil production and CO2 storage based on the evolution of net CO2 utilization ratios.
|File Size||1 MB||Number of Pages||16|
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