Numerical Studies and Analyses on the Acidizing Process in Vug Carbonate Rocks

Jia, Cunqi; Sepehrnoori, Kamy; Zhang, Haiyang; Ye, Jun

doi:10.3389/feart.2021.712566

Cited by 6 publications

(2 citation statements)

References 55 publications

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“…Qi et al [54] regarded fractures as matrices with specific high porosity and utilized COMSOL software to explore the influence of fracture geometry on the initiation and propagation of wormholes. Through parameter sensitivity analysis, Jia et al [55] examined the reaction flow processes of two typical core scales of vugular carbonate rocks as well as isolated vug carbonate rocks. They found that the vug filling degrees and vug diameter all had a significant effect on the reactive flow of fluids in carbonate rocks.…”

Section: Introductionmentioning

confidence: 99%

Modeling reactive flow dynamics of gelled acid in fracture-vuggy carbonates: a coupled thermal-hydrological-chemical simulation

Kong,

Liu,

Zhang

et al. 2024

Sci. Tech. Energ. Transition

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In engineering, gelled acids play a crucial role in facilitating reactive flow phenomena across diverse mediums. This study undertakes a comprehensive numerical investigation into the reactive flow dynamics within fracture-vuggy carbonates, employing gelled acid as the agent. The mathematical model intricately couples thermal, hydrological, and chemical aspects to provide a holistic understanding of the process. Fractures are meticulously modeled using a pseudo-fracture approach, while vugs are delineated as highly porous matrix clusters. The simulation meticulously examines the influence of vugs and fractures, in conjunction with the rheological behavior of gelled acid, on the dissolution process. Our findings reveal that compared to hydrochloric acid, gelled acid is more effective in treating high-temperature carbonate rocks. A lower power law index induces a more pronounced response in shear stress, resulting in a more uniform dissolution pattern. Moreover, the presence of vugs and fractures exerts a significant impact on both the trajectory of wormhole growth and its penetration depth. As the length of fractures increases and their number multiplies, their dominant influence on the growth of wormholes becomes more pronounced. Furthermore, an abundance of fractures may attenuate the influence of vugs. This study highlights the importance of controlling the power-law index and understanding the complex interactions between fractures and vugs for reactive flow.

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Section: Introductionmentioning

confidence: 99%

Modeling reactive flow dynamics of gelled acid in fracture-vuggy carbonates: a coupled thermal-hydrological-chemical simulation

Kong,

Liu,

Zhang

et al. 2024

Sci. Tech. Energ. Transition

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“…Some efforts have been made to investigate the influence of fractures and vugs on dissolution dynamics (Kalia and Balakotaiah, 2009;Izgec et al, 2010;Liu et al, 2017aLiu et al, , 2017bHuang et al, 2020;Wang et al, 2020;Jia et al, 2021b). Kalia and Balakotaiah (2009) considered fractures and vugs as a matrix with abnormally high porosity and evaluated the role of their location in pattern formation.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Xue

Feng³

et al. 2023

Adv. Geo-Energy Res.

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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 of specific lengths and conductivities around the wellbore. The formation of wormholes depends on the injection rate for a particular acid-mineral system and can be predicted through numerical simulations of the reactive phenomenon during acidization. In this paper, the commonly used two-scale continuum model is enhanced to encompass fractured-vuggy porous media. The fractures are characterized by a pseudo-fracture model, while vugs are represented by a cluster of anomalous matrices with high porosity. Moreover, a method for generating random pore-fracture-vuggy models is proposed. The governing equations are discretized by the finite volume method and are solved under three-dimensional linear and radial conditions. Sensitivity analysis of dissolution dynamics with respect to fracture and vug parameters is performed. The simulation results indicate that both fractures and vugs significantly impact wormhole development. Except for fractures perpendicular to the acid flow direction, fractures in other directions play a crucial role in determining the direction of wormhole growth.

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Fracture and vug effects on wormhole pattern during acidizing of triple porosity carbonate rocks

Mahdizadeh Asl,

Sedaee,

Ebrahimi Kandowjani

2024

Geoenergy Science and Engineering

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Numerical Studies and Analyses on the Acidizing Process in Vug Carbonate Rocks

Cited by 6 publications

References 55 publications

Modeling reactive flow dynamics of gelled acid in fracture-vuggy carbonates: a coupled thermal-hydrological-chemical simulation

Modeling reactive flow dynamics of gelled acid in fracture-vuggy carbonates: a coupled thermal-hydrological-chemical simulation

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

Fracture and vug effects on wormhole pattern during acidizing of triple porosity carbonate rocks

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