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oa Hydrates of 99.52 % CO2-Rich Mixture (CCS fluid) in Equilibrium with Brine Solutions: Measurements and Predictions
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, World CCUS Conference 2025, Sep 2025, Volume 2025, p.1 - 6
Abstract
This study investigates the inhibition of hydrate formation in a CO2-rich gas mixture (CO2, O2, N2, CH4, CO, H2, Ar, CH3OH). using multicomponent salt solutions at concentrations of 2.4 wt.%, 13.65 wt.%, and 27.3 wt.%. The setup, test fluids, methodology, and results for hydrates formed in equilibrium with varying salt solution concentrations are presented. Measurements were conducted using an isochoric pressure-search method at pressures up to 45 MPa, over a wide range of temperatures (250 K–293K). Experimental data were compared with predictions from a thermodynamic model based on the Cubic-Plus-Association equation of state (EoS), while hydrate-forming conditions were modelled using the van der Waals and Platteeuw solid solution theory. Results indicate that hydrate stability is significantly influenced by inhibitor concentration, offering valuable guidelines for the design and operation of pipeline systems involved in offshore gas transport and storage of CO2-rich streams.