Coupled thermal–hydraulic–mechanical model for an enhanced geothermal system and numerical analysis of its heat mining performance

Zhou, Luming; Zhu, Zhende; Xie, Xiangyu; Hu, Yuzheng

doi:10.1016/j.renene.2021.10.014

Cited by 38 publications

(17 citation statements)

References 40 publications

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“…Wang et al (2019) established a THM coupling mathematical model, studied the flow, stress and temperature of HDR reservoir under different injection flow rates based on the equivalent continuum method, and studied the heat extraction performance of EGS, but there were too few influence factors in the study. Zhou et al (2022) established a THM coupling model for injection and production of HDR and compared the heat extraction performance of water injection development of HDR without considering coupling, partial coupling and full coupling. Jiang et al (2014) proposed a three-dimensional transient model of the underground thermal-hydraulic process of EGS, which regarded the geothermal reservoir as an equivalent porous medium with a single porosity.…”

Section: Introductionmentioning

confidence: 99%

Evaluation methods and influence factors of heat extraction performance in hot dry rock reservoir under multi-field coupling

Zhao

Wang

Song

et al. 2023

Energy Exploration & Exploitation

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How to improve the heat extraction performance of HDR (hot dry rock) is one of the most concerned problems in HDR extraction. The key is to take a reasonable method to evaluate the heat extraction performance of hot dry rock and find out the main factors influencing the heat extraction performance of hot dry rock. The permeability of HDR reservoir, well type, well spacing, well pattern and injection flow rate of cold water have important influence on heat extraction performance of HDR reservoir. Based on this, a multi-field coupling mathematical model for injection and production of HDR is established and solved by finite element method to analyze the evolutions of seepage field, temperature field and stress field in HDR reservoir. Then, high temperature production time and heat extraction rate were introduced to quantitatively evaluate the heat extraction performance of HDR reservoir under different reservoir permeability, different well type, different well spacing, different well pattern and different injection flow rate. The research results show that different reservoir permeability has little influence on the heat extraction performance of HDR reservoir. Comparing the vertical well production system with the horizontal well production system, horizontal well production system has longer high temperature production time, and vertical well production system has higher heat extraction rate. The greater the well spacing and injection flow rate, the better the heat extraction performance of HDR reservoir. The heat extraction performance of the well pattern is not necessarily better than that of the one-injection and one-production well pattern, the heat extraction performance of the one-injection two-production well pattern and the two-injection one-production well pattern is worse than that of the one-injection one-production well pattern, and the heat extraction performance of the four-injection one-production well pattern and the one-injection four-production well pattern is better than that of the one-injection one-production well pattern. The research results can provide a theoretical basis for the formulation of economic and reasonable HDR development program and working system, and realize efficient utilization of HDR reservoir.

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Section: Introductionmentioning

confidence: 99%

Evaluation methods and influence factors of heat extraction performance in hot dry rock reservoir under multi-field coupling

Zhao

Wang

Song

et al. 2023

Energy Exploration & Exploitation

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“…It should be pointed out that not only can nonlinearly coupled problems involving multiple physical processes be widely encountered in hydrothermal ore-forming systems, but also they can be broadly found in enhanced geothermal systems. [12][13][14][15][16][17][18][19][20] For example, to computationally simulate an enhanced geothermal system, a nonlinearly coupled problem involving heat transfer (i.e., thermal), pore-fluid flow (i.e., hydraulic) and rock deformation (i.e., mechanical) processes has been extensively considered in recent years. [12][13][14][15][16][17][18][19][20] However, compared with simulating enhanced geothermal systems, chemical reaction processes must be considered in the computational simulations of hydrothermal ore-forming systems.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15][16][17][18][19][20] For example, to computationally simulate an enhanced geothermal system, a nonlinearly coupled problem involving heat transfer (i.e., thermal), pore-fluid flow (i.e., hydraulic) and rock deformation (i.e., mechanical) processes has been extensively considered in recent years. [12][13][14][15][16][17][18][19][20] However, compared with simulating enhanced geothermal systems, chemical reaction processes must be considered in the computational simulations of hydrothermal ore-forming systems. Otherwise, an ore deposit cannot be quantitatively evaluated in a hydrothermal ore-forming system.…”

Section: Introductionmentioning

confidence: 99%

“…It should be pointed out that not only can nonlinearly coupled problems involving multiple physical processes be widely encountered in hydrothermal ore‐forming systems, but also they can be broadly found in enhanced geothermal systems 12–20 . For example, to computationally simulate an enhanced geothermal system, a nonlinearly coupled problem involving heat transfer (i.e., thermal), pore‐fluid flow (i.e., hydraulic) and rock deformation (i.e., mechanical) processes has been extensively considered in recent years 12–20 .…”

Section: Introductionmentioning

confidence: 99%

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FEM‐based dual length‐scale simulation of hydrothermal ore‐forming systems involving convective flow in fluid‐saturated porous media

Zhao,

Liu

2023

Num Anal Meth Geomechanics

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Hydrothermal ore‐forming systems usually involve coupled processes among pore‐fluid flow, heat transfer, mass transport and chemical reactions in fluid‐saturated porous media. The finite element method (FEM) has provided a powerful tool to solve hydrothermal ore‐forming problems associated with pore‐fluid convective flow. Depending on different interests of research, a hydrothermal ore‐forming system may be simulated at two different length‐scale models, such as a regional (i.e., large length‐scale) model or a deposit (i.e., small length‐scale) model. However, there is an unsolved issue to guarantee the consistency between the applied boundary conditions to a deposit model and the predicted results, at exactly the same location as the boundary of the deposit model, from using the regional model. This paper proposes a FEM‐based dual length‐scale simulation procedure to address this issue. In the proposed procedure, a regional model of coarse mesh is first simulated by the FEM. Since a deposit model is located within the regional model, the applied boundary conditions to the deposit model of fine mesh can be determined from the simulation results of the regional model, so that the consistency can be guaranteed at the common boundary between the deposit model and the regional model. Main outcomes of this study have demonstrated that: (1) the proposed FEM‐based dual length‐scale simulation procedure is suitable and applicable for solving coupled problems involving pore‐fluid flow, heat transfer, mass transport and chemical reactions in fluid‐saturated porous media; (2) the proposed procedure is predictive because it is unnecessary to know the location of an ore deposit prior to the simulation of a hydrothermal ore‐forming system; (3) the boundary condition of a deposit model of fine mesh is consistent with the simulation results obtained from the regional model of coarse mesh, so that the reliability of the simulation results obtained from the deposit model can be ensured.

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“…The numerical simulation method can effectively solve the above problems, which can be divided into two types: one based on continuum mechanics, and one based on discontinuum mechanics. The finite element method (FEM) [ 10 ] is a commonly used method based on continuum mechanics for simulating crack propagation. However, the governing equation of the FEM is derived from continuum mechanics, and the stress field at the crack tip is mathematically singular.…”

Section: Introductionmentioning

confidence: 99%

Simulations of Fractures of Heterogeneous Orthotropic Fiber-Reinforced Concrete with Pre-Existing Flaws Using an Improved Peridynamic Model

Zhou

Zhu

et al. 2022

Materials

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The propagation and coalescence of cracks in fiber-reinforced concretes (FRCs) is the direct cause of instability in many engineering structures. To predict the crack propagation path and failure mode of FRCs, an orthotropic-bond-based peridynamic (PD) model was established in this study. A kernel function reflecting long-range force was introduced, and the fiber bond was used to describe the macroanisotropy of the FRC. The crack propagation process of the FRC plate with flaws was simulated under uniaxial tensile loading. The results showed that under homogeneous conditions, the cracks formed along the centerline of the isotropic concrete propagate in a direction perpendicular to the load. Under anisotropic conditions, the cracks propagate strictly in the direction of the fiber bond. The failure degree of the FRC increases with the increase in heterogeneity. When the shape parameter is 10 and the fiber bond is 0°, the failure mode changes from tensile to shear failure. When the fiber bond is 45°, the FRC changes from a state where outer cracks penetrate the entire specimen to a state where cracks coalesce at the middle. It was found that the improved model can effectively simulate the crack propagation processes of orthotropic FRC materials.

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Coupled thermal–hydraulic–mechanical model for an enhanced geothermal system and numerical analysis of its heat mining performance

Cited by 38 publications

References 40 publications

Evaluation methods and influence factors of heat extraction performance in hot dry rock reservoir under multi-field coupling

Evaluation methods and influence factors of heat extraction performance in hot dry rock reservoir under multi-field coupling

FEM‐based dual length‐scale simulation of hydrothermal ore‐forming systems involving convective flow in fluid‐saturated porous media

Simulations of Fractures of Heterogeneous Orthotropic Fiber-Reinforced Concrete with Pre-Existing Flaws Using an Improved Peridynamic Model

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