The impact of pore-throat shape evolution during dissolution on carbonate rock permeability: Pore network modeling and experiments

• Calcite dissolution can generate a spectrum of pore shape geometries. In existing PNMs, conductance relations ignore evolution. New were derived from single scale simulations. These are function volume and imposed regime. Permeability may be overestimated by up to 27% if change is neglected. Pore network model simulation (PNM) an important method simulate reactive transport processes in porous media investigate constitutive relationships between permeability porosity that implemented continuum-scale reactive-transport modeling. The models (rtPNMs) assume the initially cylindrical throats maintain their throat updated using form Hagen-Poiseuille relation. However, context calcite dissolution, earlier studies have shown during attain shapes, depending upon reactive-flow conditions (Agrawal et al., 2020). current study, we new for calculation as evolution range flow reaction conditions. used build animproved (nrtPNM). Using model, porosity-permeability changes simulated compared against models. order validate conducted two sets flow-through experiments on Ketton limestone samples. Acidic solutions (pH 3.0) injected at Darcy velocities i.e., 7.3 × 10 ?4 1.5 m. s ? 1 while performing X-ray micro-CT scanning. Experimental values sample estimated independent ways: through PNM Direct Numerical Simulation. Both approaches images samples beginning end experiments. Extracted networks, obtained experiment, PNMs (rtPNM nrtPNM). We observed experimental conditions, most maintained prescribed such both rtPNM nrtPNM showed similar permeability. This was found reasonable agreement with experiment. Next, applied regimes compare evolutions nrtPNM. certain regimes, neglecting lead overestimation predicted over 50% fitted exponent relations. summary, this study under high rate accurate enough, it overestimates lower rates.