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Description
Salt precipitation during geological carbon storage in saline aquifers significantly jeopardizes long-term storage efficiency and security. This study investigates the impact of porous media disorder on salt precipitation mechanisms during CO₂ injection by integrating pore-scale numerical simulations with microfluidic experiments. By analyzing varying initial brine salinities and injection rates, three distinct precipitation patterns were identified: displacement, breakthrough, and sealing. An increase in the disorder of the porous medium was found to shift the dominant precipitation pattern from sealing towards displacement.A three-dimensional phase diagram of initial salt concentration, injection rate, and pore disorder was constructed.In disordered porous media, salt precipitation tends to occur in larger pores rather than throats, thus being more likely to present a displacement pattern and reducing the risk of pore clogging. The simulation results indicate that increasing the gas injection rate or decreasing the initial salt concentration can significantly improve the CO₂ injection effect.
| Country | China |
|---|---|
| Green Housing & Porous Media Focused Abstracts | This abstract is related to Green Housing |
| Student Awards | I would like to submit this presentation into the Earth Energy Science (EES) and Capillarity Student Poster Awards. |
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