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Real-rock microfluidic platform for quantifying chemical dissolution and mechanical erosion in a multiphase

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We developed a new microfluidic platform to observe fluid-rock erosion in real rocks. This tool reveals how CO2 bubbles control chemical and mechanical erosion, advancing our understanding of subsurface processes.

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Area of Science:

  • Geochemistry
  • Geology
  • Fluid Dynamics

Background:

  • Fluid-rock interactions are crucial but poorly understood due to limited observation tools.
  • Existing methods struggle to balance spatial resolution and temporal dynamics.

Purpose of the Study:

  • To develop an integrated platform for simultaneous visualization and quantification of erosion dynamics in multiphase reactive systems.
  • To investigate erosion during acid-rock interactions and identify regime transitions.

Main Methods:

  • Developed a real-rock microfluidic platform using limestone.
  • Integrated fluorescence microscopy, micro-particle image velocimetry, and ion chromatography.
  • Monitored solid-liquid-gas interfaces and flow fields at micrometer resolution.

Main Results:

  • Identified a transition between transport-limited and reaction-limited erosion regimes controlled by CO2 bubble mobility.
  • Observed enhanced dissolution and detachment in the transport-limited regime with immobile bubbles.
  • Found suppressed erosion in the reaction-limited regime due to bubble shielding.

Conclusions:

  • Derived scaling laws for chemical and mechanical erosion rates.
  • Validated a theoretical model for regime transition based on Péclet number.
  • The platform offers a versatile tool for studying pore-scale reactive transport in subsurface environments.