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Abstract: The study of CO2 dissolution effects on rock reservoirs during CO2 storage and CO2-enhanced oil and gas recovery is crucial for the effectiveness of underground carbon sequestration projects and for improving oil and gas recovery rates. In this study, the Darcy-Brinkman-Stokes (DBS) model is used to model the reaction-transport at the rock pore scale, based on the theory of microscopic continuous media, and solved discretely using COMSOL, a coupled Multiphysics field simulation software, to investigate the dissolution reactions and the evolution of the porous medium during carbon sequestration. The model elucidates the nonlinear coupling inherent to the mineral dissolution process, offering insights into the intricate interactions between seepage, solute transport, and reaction fluid chemistry. The findings indicate that soluble minerals are progressively dissolved over time, leading to the formation of new seepage channels and a consequent reduction in the dissolution rate within the original seepage channels. An increase in formation water salinity results in a reduction in solution pH, which in turn affects the chemistry of reservoir minerals. Conversely, an increase in reservoir temperature, pressure, and injection rate promotes calcite dissolution. Furthermore, the augmented pressure differential propels the expansion of the reaction zone towards the midstream, thereby accelerating the dissolution and reaction process of calcite nodes. These findings provide a theoretical foundation for future carbon capture and storage technologies.
Key words: gas-water two-phase seepage, multiphase dissolution, multiphase interface evolution, mass transfer and diffusion, and chemical reaction dynamics.
| Country | China |
|---|---|
| Water & Porous Media Focused Abstracts | This abstract is related to Water |
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