3D Voronoi grid dedicated software for modeling gas migration in deep layered sedimentary formations with TOUGH2-TMGAS

Bondu, Stefano; Battistelli, Alfredo; Berry, Paolo; Bortolotti, Villiam; Consonni, Alberto; Cormio, Carlo; Geloni, Claudio; Vasini, Ester Maria

doi:10.1016/j.cageo.2017.03.008

Cited by 11 publications

(6 citation statements)

References 16 publications

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“…Energies 2020, 13, 2174 6 of 20 Also, the issues concerning the generation of the discretization grid and its usefulness for modelling various physical phenomena have been developed in recent years, which is evidenced by a number of works [79][80][81][82]. Therefore, it was based on previous works on mesh for TOUGH2 code and prepared the grid as follows.…”

Section: Numerical Methodology and Mathematical Modelmentioning

confidence: 99%

Assessment of the Effective Variants Leading to Higher Efficiency for the Geothermal Doublet, Using Numerical Analysis‒Case Study from Poland (Szczecin Trough)

et al. 2020

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Numerical models of geothermal doublet allows us to reduce the high risk associated with the selection of the most effective location of a production well. Furthermore, modeling is a suitable tool to verify possible changes in operational geothermal parameters, which guarantees liveliness of the system. An appropriate selection of software as well as the methodology used to generate numerical models significantly affects the quality of the obtained results. In this paper, the authors discuss the influence of such parameters as grid density and distance between wells on the efficiency of geothermal heating plant. The last stage of the analysis was connected with estimation of geothermal power potential for a hypothetical geothermal doublet. Numerical simulations were carried out using the TOUGH2 code, which applies the finite-difference method. The research was conducted in the Szczecin Trough area (NW Poland), based on archival data from Choszczno IG-1 well. The results demonstrated that in the studied case of the Choszczno region, the changes in the distance of boreholes can have a visible influence on obtained results; however the grid density of the numerical model did not achieve a significant impact on it. The results show the significant importance of numerical modeling aimed at increasing the efficiency of a potential geothermal heating plant.

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Section: Numerical Methodology and Mathematical Modelmentioning

confidence: 99%

Assessment of the Effective Variants Leading to Higher Efficiency for the Geothermal Doublet, Using Numerical Analysis‒Case Study from Poland (Szczecin Trough)

et al. 2020

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“…Because of the complexity of simulating two-phase flow on highly unstructured Voronoi meshes, new experimental solvers were also used in the simulation. As discussed in Bonduà et al (2017) andFreeman et al (2014) the Jacobian matrices for unstructured meshes are more difficult to solve than for structured meshes both because of additional connections and the loss of the banded matrix structure. As shown in Table 5, the average number of connections for each cell is 11 for all three Rock Springs Uplift meshes and the maximum is 36 or 37 connections.…”

Section: Simulation Implementationmentioning

confidence: 99%

“…There are fewer studies of fully three-dimensional Voronoi meshes, due to the challenge of creating Voronoi meshes in three dimensions. For example, Merland et al (2014) and Bonduà et al (2017) presented three-dimensional meshes that are strictly Voronoi; however, they may both approximate interior boundary locations. Bonduà et al (2017) accurately modeled gas flow in a complex reservoir structure in a hybrid Voronoi-hexahedral mesh with far fewer cells than a comparable hexahedral mesh.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Merland et al (2014) and Bonduà et al (2017) presented three-dimensional meshes that are strictly Voronoi; however, they may both approximate interior boundary locations. Bonduà et al (2017) accurately modeled gas flow in a complex reservoir structure in a hybrid Voronoi-hexahedral mesh with far fewer cells than a comparable hexahedral mesh. Freeman et al (2014) presented the development of a Voronoi meshing software, MeshVoro, for the TOUGH family of codes.…”

Section: Introductionmentioning

confidence: 99%

“…This software has the ability to create a mesh that satisfies the Voronoi/Delaunay criteria and conforms exactly to difficult material geometries for non-manifold surfaces. Much like Freeman et al (2014) and Bonduà et al (2017), the present work uses Voronoi meshes to improve the accuracy of simulations using the TPFA for complex reservoir structures. VoroCrust generates meshes based on closed volumes with watertight input surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Voronoi Meshing to Accurately Capture Geological Structure in Subsurface Simulations

et al. 2022

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Mesh generation lies at the interface of geological modeling and reservoir simulation. Highly skewed or very small grid cells may be necessary to accurately capture the geometry of geological features, but the resulting poorly scaled or small grid cells can have a substantial negative impact on simulator accuracy and speed. One way to minimize numerical errors caused by gridding complex structures is to simulate on high-quality Voronoi meshes, which reduce grid orientation effects in fluid flow. This work presents a complete methodology to create Voronoi simulation grids, model fluid flow in complex geological systems, and visualize the results. A recently developed Voronoi meshing method that can automatically generate provably good unstructured meshes that conform to input surfaces creating closed volumes is used. Initially an analytical benchmark simulation is presented to validate the quality of the meshes and simulation results and demonstrate the superiority of simulation results using Voronoi meshes over flexed-hexahedral meshes on a domain with internal features. Next, meshes are created for test structures representing four of the most common geological features in the subsurface: layering, pinch-out, an interior lens that tapers to zero thickness on all sides and a fault with offset. Two benchmark flow simulations are run for each test structure. Finally, a realistic geological example for CO$$_2$$ 2 injection into an anticline is simulated. Three realizations of the Voronoi mesh at the same resolution are generated for the simulations. Each mesh is highly refined near the injection wells and coarse in areas of less interest. These three meshes are used to model the CO$$_2$$ 2 plume in the subsurface as it migrates to the top of the structure and then fills downward. Simulations on the meshes with randomly generated elements inside the input volumes each give slightly different fingering patterns for the viscous-unstable buoyant gas flow. The results presented in this work show a promising step towards utilizing fully automated Voronoi meshing for subsurface flow simulations in complex geology.

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Numerical modeling of two-phase flow in deformable porous media: application to CO$$_2$$ injection analysis in the Otway Basin, Australia

et al. 2021

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3D Voronoi grid dedicated software for modeling gas migration in deep layered sedimentary formations with TOUGH2-TMGAS

Cited by 11 publications

References 16 publications

Assessment of the Effective Variants Leading to Higher Efficiency for the Geothermal Doublet, Using Numerical Analysis‒Case Study from Poland (Szczecin Trough)

Assessment of the Effective Variants Leading to Higher Efficiency for the Geothermal Doublet, Using Numerical Analysis‒Case Study from Poland (Szczecin Trough)

Voronoi Meshing to Accurately Capture Geological Structure in Subsurface Simulations

Numerical modeling of two-phase flow in deformable porous media: application to CO$$_2$$ injection analysis in the Otway Basin, Australia

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