Three-dimensional simulation of wormhole propagation in fractured-vuggy carbonate rocks during acidization

Acidization is a widely used stimulation technique for carbonate reservoirs aimed at removing formation damage, and if successful, can result in the creation of wormholes specific lengths conductivities around wellbore. The depends on injection rate particular acid-mineral system be predicted through numerical simulations reactive phenomenon during acidization. In this paper, commonly two-scale continuum model enhanced to encompass fractured-vuggy porous media. fractures are characterized by pseudo-fracture model, while vugs represented cluster anomalous matrices with high porosity. Moreover, method generating random pore-fracture-vuggy models proposed. governing equations discretized finite volume solved under three-dimensional linear radial conditions. Sensitivity analysis dissolution dynamics respect fracture vug parameters performed. simulation results indicate that both significantly impact wormhole development. Except perpendicular acid flow direction, other directions play crucial role determining direction growth. Cited as: Liu, P., Kong, X., Feng, G., Zhang, K., Sun, S., Yao, J. Three-dimensional propagation rocks Advances Geo-Energy Research, 2023, 7(3): 199-210. https://doi.org/10.46690/ager.2023.03.06