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.