Modeling, simulation and comparison of models for wormhole...

E - Fixed Constructions – 21 – B

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E21B 43/25 (2006.01) E21B 41/00 (2006.01) E21B 43/00 (2006.01) E21B 43/16 (2006.01)

Patent

CA 2486775

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.

La présente invention concerne un nouveau modèle de continuum/ramené à une moyenne permettant de simuler la formation de trous de vers au cours de la stimulation de matrice de carbonates. Le modèle ramené à la moyenne selon l'invention prend en compte les propriétés physiques au niveau des pores par accouplement de phénomènes d'échelle de pores locaux à des variables macroscopiques (vitesse de Darcy, pression et concentration de mélange en tasse de réactifs) à travers les relations structure-propriétés (perméabilité-porosité, dimensions des pores moyenne-porosité et zone interfaciale-porosité) et de la dépendance du coefficient de transfert de masse liquide-solide et du coefficient de dispersion en phase liquide par rapport aux variables d'échelle des pores qui évoluent (dimension des pores moyenne, nombres de Reynolds et de Schmidt locaux). Ledit modèle permet de meilleures prédictions du cheminement préférentiel de l'écoulement, de sorte que le traitement de la matrice peut être ajusté afin de favoriser les formations de trous de vers.

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