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 local 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 transfer coefficient and fluid phase dispersion coefficient on the evolving pore scale variables (average pore size, local Reynolds and Schmidt numbers).This model allows better predictions of the flow channeling so that the matrix treatment may be adjusted to promote wormhole formations.