MODELING SIMULATION AND COMPARISON OF MODELS FOR WORMHOLE FORMATION DURING MATRIX STIMULATION OF CARBONATES

摘要

A new averaged/continuum model is presented for simulation of wormhole formation during matrix stimulation of carbonates. The averaged model presented here takes into account the pore level physics by coupling the loc al pore scale phenomena to the macroscopic variables (Darcy velocity, pressure and reactant cup-mixing concentration) through the structure-property relationships (permeability-porosity, average pore size-porosity and interfacial area-porosity) and the dependence of the fluid-solid mass transf er coefficient and fluid phase dispersion coefficient on the evolving pore scal e variables (average pore size, local Reynolds and Schmidt numbers).This model allows better predictions of the flow channeling so that the matrix treatmen t may be adjusted to promote wormhole formations.