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Abstract

Summary

This study presents a standardized method for preparing and measuring CO solubility in brine under geological storage conditions. Accurate CO solubility measurements are crucial for laboratory research on CO storage and field-scale simulations. The solubility of CO 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 CO 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 CO solubility experiments.

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/content/papers/10.3997/2214-4609.202522120
2025-09-01
2026-02-15
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References

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