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Abstract

Summary

This study focuses on the geochemical modeling of cement alteration in CO-saturated brine under geological storage conditions, crucial for carbon storage projects. Cementing is essential in well construction to provide structural support and prevent fluid migration. When CO is injected into geological formations, it dissolves in brine, lowering pH and potentially causing cement alteration. Cement constituents, like calcium hydroxide and calcium silicate hydrates, react with CO-rich brine, leading to calcium carbonate precipitation and amorphous silica formation, which can alter the cement’s porosity and permeability. This process, known as “self-healing,” may protect cement integrity initially, but prolonged exposure can degrade the material, impacting its mechanical strength. The study employs PHREEQC and PFLOTRAN for geochemical modeling, simulating both equilibrium and kinetic reactions to evaluate cement performance over time (e.g., 90 days). These models predict mineralogical changes and assess cement integrity under CO injection conditions. By comparing modeled predictions with experimental data, the study aims to enhance the understanding of cement behavior in geological CO storage, ultimately supporting the long-term reliability of carbon storage systems. The research combines numerical modeling with experimental insights for a more realistic assessment of subsurface behavior in carbon storage projects.

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/content/papers/10.3997/2214-4609.202522119
2025-09-01
2026-02-15

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/content/papers/10.3997/2214-4609.202522119
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Geochemical Modeling of Cement Alteration in CO2-Saturated Brine Using PHREEQC and PFLOTRAN
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202522119
/content/papers/10.3997/2214-4609.202522119
/content/papers/10.3997/2214-4609.202522119
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