Fluid-driven migration of dissolved irregular particles in corroded porous media: An isometric shrinkage model

The irregular particle migration in porous media is investigated considering particle dissolution and multi-component porous skeleton corrosion under high Damköhler conditions. A novel coupled smoothed profile method and lattice Boltzmann method are proposed to model the complex dynamics of dissolved irregular particle migration. Additionally, a simplified particle dissolution/enlargement model called the isometric shrinkage/expansion model is proposed to simplify the computation of the particle dissolution. Notably, a reduction in polygonal particle edges is observed due to particle dissolution. The effects of particle shape, particle number, particle initial distribution, and porous skeleton component corrosion rate ratio are investigated. Flat particles (potato-shaped, pebble-shaped, and rice-shaped particles) cause less permeability impairment than non-flat particles (cylinder-shaped and gravel-shaped particles). Rice-shaped particles result in low permeability impairment and high permeability increment. The particle initial distribution affects the porosity and permeability evolution. Optimizing the initial particle distribution can expedite the increase in porous skeleton permeability. The permeability increases with multi-component porous skeleton corrosion rate ratio. An increase in the corrosion degree of one component leads to a reduction in the corrosion degree of other components.