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oa Investigating CO2 with Light Impurities for CO2 Storage: Data and Model Comparison
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, World CCUS Conference 2025, Sep 2025, Volume 2025, p.1 - 5
Abstract
Geological CO2 storage is a key strategy in reducing greenhouse gas emissions, but its economic viability is challenged by risks associated with complex CO2 phase behaviour, especially when mixed with impurities present in capture processes, as well as those present in underground reservoirs. These impurities complicate aspects such as injection risks, storage capacity, and safety. The CO2plus project aims to address these challenges by developing models to analyse the intricate phase behaviour during injection and storage, focusing on issues like hydrate formation, Joule-Thomson cooling, and salt clogging.
In this contribution phase equilibrium data for CO2 + Ar, CO, H2, H2S, N2, O2, and SO2 are collected from literature and curated for further model development. The Soave-Redlich-Kwong, Peng-Robinson, Cubic Plus Association, and PC-SAFT equations of state are fitted to the curated data and the model descriptions are compared to those of the newly updated EOS-CG, a model designed specifically for humid gases and CO2-rich mixtures. Overall, the models do comparatively well, but EOS-CG outperforms all models in the mixture critical regions.
