Selection of CO2 Mixture Composition for Flow Assurance Analysis

Transported and geologically stored CO2 contains several impurities that depend on its source and associated capture technology. Impurities in anthropogenic CO2 can have damaging impacts on the different elements of a CCS system, which must be considered when developing a CO2 specification (Table 1). Thus, characterising all the impurities and determining the required purity of the CO2 mixture is critically important for the safe design and operation of CCS transport and storage systems. It is important to note that CO2 specifications relate to normal operations. Short-term excursions outside of the recommended maximum concentrations for each impurity may be permissible provided they do not lead to health and safety risks and / or risks to the mechanical integrity of the asset.