Pore-Network Modeling of Carbonate Acidization

Tansey, Joseph Frederic

doi:10.2118/173472-stu

Cited by 12 publications

(4 citation statements)

References 42 publications

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“…The pore network model is the most realistic model, in which the initial calculation domain uses the pore network obtained through the true target stimulated core sample. The acidizing process is simulated inside each pore and throat of the real core sample (Tansey, 2014). However, huge calculation expense decides that the pore network model can only be conducted within the limited domain (Tansey and Balhoff, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of Isolated Fracture on the Carbonate Acidizing Process

Jia

Huang

et al. 2021

Front. Earth Sci.

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Carbonate reservoirs are one of the most important fossil fuel sources, and the acidizing stimulation is a practical technique for improving the recovery of carbonate reservoirs. In this study, the improved two-scale continuum model, including the representative elementary volume (REV) scale model and the upscaling model, is used to study the acidizing process with an isolated fracture. Based on this model, a comprehensive discussion is presented to study the effect of the physical parameters of the isolated fracture on the acidizing results and dissolution images, including the isolated fracture geometry, location, and morphology. Results show that the isolated fracture system is still the target system for the acidizing stimulation. The isolated fracture provides a limited contribution to the core porosity. The permeability of the core sample with fracture can be obviously increased only when the fracture penetrates through the whole sample. The existence of the isolated fracture reduces the consumption of acid solution to achieve a breakthrough. The acidizing curve is sensitive to the change of the length, aperture, and position of the isolated fracture. The acidizing curve difference corresponding to different rotation angles has not changed significantly for clockwise rotation and anticlockwise rotation groups.

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Section: Introductionmentioning

confidence: 99%

Effect of Isolated Fracture on the Carbonate Acidizing Process

Jia

Huang

et al. 2021

Front. Earth Sci.

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“…Firstly, the momentum and continuity equations are solved to obtain the velocity and pressure fields. Because a strong coupling exists between velocity and pressure, equations (19) and (20) are solved simultaneously using a staggered grid. The pressure field is stored at cell centroids, while the velocity field is stored at cell faces.…”

Section: Dimensionless Modelmentioning

confidence: 99%

“…To investigate the dissolution process, numerous experiments have been carried out, which provide a direct observation of the dissolution dynamic in rocks as well as a fundament for mathematical modelling to predict the wormhole formation. The numerical models that have been proposed over the last few decades, can be broadly classified into four types: (1) dimensionless model [8][9][10]; (2) capillary tube model [11][12][13][14][15]; (3) network model [7,[16][17][18][19]; and (4) continuum model [6,[20][21][22][23]. Reviews of these models, along with summaries of their limitations and assumptions, can be found in [24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional simulation of acidizing process in carbonate rocks using the Darcy–Forchheimer framework

Liu

Ren

Kong

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Acidizing is an economical and effective practice to remove the near wellbore damage, which is performed by injecting acid into the formation through the wellbore. The injected acid dissolves the rock, by which the permeability nearby the wellbore can be improved. For a carbonate reservoir, the injected acid dissolves some of the minerals and some narrow and long channels, named wormholes, are formed then. These wormholes can bypass the damaged zone and hence improve the productivity of the well. The process for acid dissolving rocks involves complex physicochemical change, including the chemical reactions at the pore scale and the fluid flow at Darcy scale. In this paper, a 3-D reactive flow model with non-Darcy framework is developed based on the two-scale continuum model, and is solved by using the finite volume method. Five types of dissolution patterns, named face dissolution, conical wormhole, wormhole, ramified wormhole, and uniform dissolution, are obtained as the injection velocity increases. The effect of non-Darcy flow on dissolution pattern and breakthrough volume is analyzed. It is found that there is no effect of non-Darcy on dissolution structure and breakthrough volume when the injection velocity is very low. However, when the injection velocity is very high, the generated wormhole has more branches when using the Forchheimer equation than using the Darcy equation. Moreover, the optimal injection velocity is found to be the same whether considering the non-Darcy flow or not.

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“…5 There are several theoretical models proposed to simulate the acidizing process in carbonate reservoirs. [6][7][8][9][10][11] The two-scale continuous model proposed by Panga et al 8 has gradually become the most widely used theoretical model of matrix acidizing because of its strong compatibility. 12,13 It is known that the acidizing process is influenced by many factors.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional simulation of the acidizing process under different influencing factors in fractured carbonate reservoirs

Guo

Tang

Qiao

et al. 2023

Energy Science & Engineering

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Matrix acidizing is widely used to enhance oil/gas production in the exploitation of carbonate reservoirs. In this work, a three‐dimensional (3D) hydro‐chemical‐thermal (H‐C‐T)‐coupled model was presented to improve the understanding of the acidizing process. The influence of different influencing factors was analyzed, especially the coupling effect of natural fractures and in situ stress. With the increase in acid injection concentration, the minimum pore volume of acid required for breakthrough (PVBT) decreases. The optimal injection rate and the minimum PVBT increase with increasing initial reservoir temperature. With the increasing initial reservoir permeability, the minimum PVBT increases. With the increasing initial reservoir pore diameter and specific surface area, the minimum PVBT and the optimal acid injection rate increase. When the fracture direction is perpendicular to the direction of the maximum principal stress, the fracture apertures decrease with the increase of the maximum principal stress, which leads to an increase in PVBT and wider paths of wormholes. Lastly, the present H‐C‐T‐coupled model was applied in the context of Tahe reservoir exploitation, which shows that optimizing the acid injection rate is able to enhance the connection between wellbores and natural caves.

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Pore-Network Modeling of Carbonate Acidization

Cited by 12 publications

References 42 publications

Effect of Isolated Fracture on the Carbonate Acidizing Process

Effect of Isolated Fracture on the Carbonate Acidizing Process

Three-dimensional simulation of acidizing process in carbonate rocks using the Darcy–Forchheimer framework

Three‐dimensional simulation of the acidizing process under different influencing factors in fractured carbonate reservoirs

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