Heat extraction of enhanced geothermal system<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si5.svg" display="inline" id="d1e1004"><mml:mo>:</mml:mo></mml:math> Impacts of fracture topological complexities

Liu, Gang; Yuan, Zhengwei; Zhou, Chunwei; Fu, Zhijing; Rao, Zhenghua; Liao, Shengming

doi:10.1016/j.applthermaleng.2022.119236

Cited by 15 publications

(2 citation statements)

References 49 publications

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“…Different from the recovery processes of conventional/unconventional oil and gas reservoirs, hot dry rock exploitation is the heat extraction process significantly controlled by the conductivity and connectivity of the fracture network (Li et al, 2020a(Li et al, , 2021Yoon et al, 2023). Therefore, it is of crucial importance for the detailed description of fracture characteristics (e.g., geometry, aperture) (Liu et al, 2023).…”

Section: Current Advances Of Thmc Coupled Processes For Deep Geotherm...mentioning

confidence: 99%

Multiphysics coupling in exploitation and utilization of geo-energy: State-of-the-art and future perspectives

Wan,

Yuan,

Zhou

et al. 2023

Adv. Geo-Energy Res.

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Natural gas hydrates and geothermal energy are potential sources of low-carbon geoenergy that are crucial in achieving a sustainable energy future for human society. The exploitation and utilization of these sources inherently involve thermal-hydraulicmechanical-chemical coupling processes, and these complex coupling processes need to be numerically simulated for exploitation and utilization technology developments. This paper provides a brief overview of the current status and future challenges of numerical simulations for these coupling processes in the context of exploiting and utilizing natural gas hydrates, shallow and deep geothermal energy. It also presents perspectives on how to address these challenges, aiming to advance the development of numerical coupling technology within the geo-energy exploitation and utilization communities.

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Section: Current Advances Of Thmc Coupled Processes For Deep Geotherm...mentioning

confidence: 99%

Multiphysics coupling in exploitation and utilization of geo-energy: State-of-the-art and future perspectives

Wan,

Yuan,

Zhou

et al. 2023

Adv. Geo-Energy Res.

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“…To achieve heat extraction from the hot dry rock (HDR) of deep geothermal resources, the Enhanced Geothermal System (EGS) has been proposed [1]. This involves constructing artificial geothermal reservoirs in lowpermeability HDR through engineering techniques such as hydraulic fracturing [2], as shown in Figure 1. This process aims to establish pathways for fluid flow and heat exchange within deep geothermal reservoirs, enabling the extraction of high-quality heat for direct utilization in urban heating or power generation.…”

Section: Introductionmentioning

confidence: 99%

Study on Flow and Heat Transfer in Single Rock Fractures for Geothermal Heat Extraction

Li,

Liu,

Liao

2024

Processes

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A full understanding of the fluid flow and heat transfer behaviors within a single fracture is important for geothermal heat extraction. In this study, models of single fractures with varying aperture and inner surface roughness (characterized by fractal dimension) are constructed, and a compound fracture aperture (CFA) is proposed to describe the coupled effect of fracture aperture and inner surface roughness. The effect of the fluid flow Reynolds number on heat transfer was investigated as it ranged from 4.84 to 145.63. The results show that the overall heat transfer coefficient (OHTC) in a single fracture significantly increases with the rise in fluid velocity and the compound fracture aperture. Particularly, the OHTC in a single fracture with an inner surface fractal dimension of 2.09 can be up to 1.215 times that of a parallel flat fracture when the flow velocity reaches 0.18 m/s. Moreover, for a fracture with a smaller CFA, enhancing the fracture aperture plays a decisive role in increasing the OHTC. Aperture emerges as a more sensitive optimization parameter for efficient heat extraction compared to the flow velocity. Meanwhile, based on simulation results, a convective heat transfer correlation equation is derived to provide more accurate estimates of the OHTC in rock fractures with different geometries and morphological features.

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Effect of fracture structure on heat transfer in heat pipes in a submarine hydrothermal reservoir

Yi,

Li,

Zhang

et al. 2024

Comput Geosci

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Heat extraction of enhanced geothermal system: Impacts of fracture topological complexities

Cited by 15 publications

References 49 publications

Multiphysics coupling in exploitation and utilization of geo-energy: State-of-the-art and future perspectives

Multiphysics coupling in exploitation and utilization of geo-energy: State-of-the-art and future perspectives

Study on Flow and Heat Transfer in Single Rock Fractures for Geothermal Heat Extraction

Effect of fracture structure on heat transfer in heat pipes in a submarine hydrothermal reservoir

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