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Speaker
Description
Multiphase flow coupled with rock dissolution is prevalent in subsurface energy applications and natural phenomena, such as karst formation, acid stimulation, and CO2 sequestration. The interplay between multiphase flow and rock dissolution will profoundly influence the geochemical and geophysical properties of reservoir formation. Despite its importance, we still lack a thorough understanding of the coupling of multiphase flow and rock dissolution. Here, microfluidics fabricated with the geo-materials are used to study the pore-scale mechanism of rock dissolution in a multiphase flow environment. Experimental findings reveal dissolution regimes contingent upon injection rates and the channel geometries. At lower injection rates and in more homogeneous geometries, the dissolution exhibits a uniform regime. In this regime, the evolution of the rock surface aligns with classical assumptions, facilitating the prediction of long-term dissolution rates. While under stronger flow and heterogeneous conditions, the dissolution exhibits a localized regime, and the dissolution rate deviates significantly from the classical assumptions. Experimental observations identify a pore-scale barrier mechanism that suppresses the overall dissolution rate and leads to this deviation. We also proposed a theoretical model for the regime transition, which offers guidance on the prediction of dissolution rate across various dissolution scenarios.
| Country | China |
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| Conference Proceedings | I am not interested in having my paper published in the proceedings |
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