Modeling of methane migration from gas wellbores into shallow groundwater at basin scale

Taherdangkoo, Reza; Tatomir, Alexandru; Sauter, Martin

doi:10.1007/s12665-020-09170-5

Cited by 17 publications

(5 citation statements)

References 62 publications

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“…Furthermore, with the program code being generally available, modifications can easily be made, and the source code can be adapted to specific non-standard problems. For single-phase transport problems, COMSOL represents a good choice for a simulator; however, for more complex physics (e.g., multi-phase flow [43,44], hydromechanical coupling [6,45], etc. ), further benchmarking studies need to be conducted to test the efficiency of these simulators.…”

Section: Discussionmentioning

confidence: 99%

Numerical Benchmark Studies on Flow and Solute Transport in Geological Reservoirs

Karmakar

Tatomir

Oehlmann

et al. 2022

Water

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Predicting and characterising groundwater flow and solute transport in engineering and hydrogeological applications, such as dimensioning tracer experiments, rely primarily on numerical modelling techniques. During software selection for numerical modelling, the accuracy of the results, financial costs of the simulation software, and computational resources should be considered. This study evaluates numerical modelling approaches and outlines the advantages and disadvantages of several simulators in terms of predictability, temporal control, and computational efficiency conducted in a single user and single computational resource set-up. A set of well-established flow and transport modelling simulators, such as MODFLOW/MT3DMS, FEFLOW, COMSOL Multiphysics, and DuMuX were tested and compared. These numerical simulators are based on three numerical discretisation schemes, i.e., finite difference (FD), finite element (FE), and finite volume (FV). The influence of dispersivity, potentially an artefact of numerical modelling (numerical dispersion), was investigated in parametric studies, and results are compared with analytical solutions. At the same time, relative errors were assessed for a complex field scale example. This comparative study reveals that the FE-based simulators COMSOL and FEFLOW show higher accuracy for a specific range of dispersivities under forced gradient conditions than DuMuX and MODFLOW/MT3DMS. FEFLOW performs better than COMSOL in regard to computational time both in single-core and multi-core computing. Overall computational time is lowest for the FD-based simulator MODFLOW/MT3DMS while the number of mesh elements is low (here < 12,800 elements). However, for finer discretisation, FE software FEFLOW performs faster.

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Section: Discussionmentioning

confidence: 99%

Numerical Benchmark Studies on Flow and Solute Transport in Geological Reservoirs

Karmakar

Tatomir

Oehlmann

et al. 2022

Water

Self Cite

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“…Distance to the nearest UOG well, IDW, and ID 2 W metrics was constructed using the Euclidean distance between each participant’s home and surrounding eligible UOG wells within 2, 5, and 10 km (ArcGIS 10.8.1). We selected these buffer sizes based on the hydrogeologic literature, which generally supports transport distances of 2 km or less − and the epidemiologic literature, which incorporates buffer distances up to 10 km . For ID ups , which was specific to the groundwater exposure pathway, we explored buffer sizes of 0.2, 0.3, 0.5, 1, and 2 km. , Additionally, ID ups buffers are applied around delineated flow paths from UOG well locations and not around participant homes.…”

Section: Methodsmentioning

confidence: 99%

Assessing Unconventional Oil and Gas Exposure in the Appalachian Basin: Comparison of Exposure Surrogates and Residential Drinking Water Measurements

Clark

Xiong

Soriano

et al. 2022

Environ. Sci. Technol.

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Health studies report associations between metrics of residential proximity to unconventional oil and gas (UOG) development and adverse health endpoints. We investigated whether exposure through household groundwater is captured by existing metrics and a newly developed metric incorporating groundwater flow paths. We compared metrics with detection frequencies/concentrations of 64 organic and inorganic UOG-related chemicals/groups in residential groundwater from 255 homes (Pennsylvania n = 94 and Ohio n = 161). Twenty-seven chemicals were detected in ≥20% of water samples at concentrations generally below U.S. Environmental Protection Agency standards. In Pennsylvania, two organic chemicals/groups had reduced odds of detection with increasing distance to the nearest well: 1,2-dichloroethene and benzene (Odds Ratio [OR]: 0.46, 95% confidence interval [CI]: 0.23–0.93) and m- and p-xylene (OR: 0.28, 95% CI: 0.10–0.80); results were consistent across metrics. In Ohio, the odds of detecting toluene increased with increasing distance to the nearest well (OR: 1.48, 95% CI: 1.12–1.95), also consistent across metrics. Correlations between inorganic chemicals and metrics were limited (all |ρ| ≤ 0.28). Limited associations between metrics and chemicals may indicate that UOG-related water contamination occurs rarely/episodically, more complex metrics may be needed to capture drinking water exposure, and/or spatial metrics in health studies may better reflect exposure to other stressors.

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“…According to [32][33][34][35][36], it can be known that pore water saturation should be a function of temperature and matrix suction, which has the following relationship:…”

Section: Coupled Governing Equations For Unsaturated Soilsmentioning

confidence: 99%

Thermo-Hydromechanical Coupling Responses Driven by a Central Heat Source in Unsaturated Soils

Wang¹,

Liu²,

Chen

2022

Advances in Materials Science and Engineering

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Based on the thermodynamic and thermoelastic theory, the coupled governing equations of deformation, heat transfer, and moisture migration in unsaturated soils were given. The coupled calculation process was realized by the finite element method. The hydrothermal coupling characteristics of two cases of unsaturated kaolin clay were studied by using a self-developed test device, and the test results were compared with the numerical results. The results showed that when the initial saturation of the soil is high, the volumetric water content of the measured point increases, and then it is in a stable state during the heating process. When the initial saturation is low, the volumetric water content near the heat source increases firstly and then decreases during the heating process. The rise and fall of temperature make the volumetric water content of the soil irreversible. The volumetric water content of each measured point is lower than the initial state. The closer it is to the internal measured heat source, the more obvious this phenomenon is; the lower the initial saturation is, the more obvious it is.

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Modeling of methane migration from gas wellbores into shallow groundwater at basin scale

Cited by 17 publications

References 62 publications

Numerical Benchmark Studies on Flow and Solute Transport in Geological Reservoirs

Numerical Benchmark Studies on Flow and Solute Transport in Geological Reservoirs

Assessing Unconventional Oil and Gas Exposure in the Appalachian Basin: Comparison of Exposure Surrogates and Residential Drinking Water Measurements

Thermo-Hydromechanical Coupling Responses Driven by a Central Heat Source in Unsaturated Soils

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