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oa Best Practice Approach to Live CO2 Brine Preparation and Solubility Calculation
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, World CCUS Conference 2025, Sep 2025, Volume 2025, p.1 - 5
Abstract
This study presents a standardized method for preparing and measuring CO2 solubility in brine under geological storage conditions. Accurate CO2 solubility measurements are crucial for laboratory research on CO2 storage and field-scale simulations. The solubility of CO2 in brine is influenced by pressure, temperature, and salinity, with higher pressure increasing solubility, while higher temperature and salinity reduce it.
The experimental setup used a floating piston accumulator and a mechanical rocker to mix CO2 with brine at 124 bar and 77°C over durations of 1, 3, and 5 days. Two solubility measurement techniques—mass balance and volume displacement—were compared, with results validated using Duan’s thermodynamic model.
Findings indicate that longer mixing durations improve solubility, reaching 0.868 mol/kg after 5 days. The volume displacement method provided more precise results than mass balance. The study highlights the importance of adequate mixing and pressure stabilization in CO2 solubility experiments.