Multifactor analysis of heat extraction performance of coaxial heat exchanger applied to hot dry rock resources exploration: A case study in matouying uplift, Tangshan, China

Cao, Liwen; Ma, Ke; Wang, Wei; Pan, Jienan; Wang, Qizhi; Du, Zhigang; Wang, Zhenzhi; Yuan, Wei; Zheng, Yongxiang; Shangguan, Shuantong; Qi, Xiaofei; Pan, Man; Ji, Zhongmin

doi:10.1016/j.energy.2023.128277

Cited by 4 publications

(3 citation statements)

References 52 publications

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“…Geothermal gradient, or bottom-hole temperature, is directly proportional to the maximum thermal power output (Fang et al 2018;Brown et al 2021;Niu et al 2023). Increased geothermal gradients lead to an increase in available thermal energy, and achievable heat load (Holmberg et al 2016) and it strongly influences the profitability of any system (Xiao et al 2023).…”

Section: Impact Of Geological Parametersmentioning

confidence: 99%

A comprehensive review of deep borehole heat exchangers (DBHEs): subsurface modelling studies and applications

Kolo,

Brown,

Nibbs

et al. 2024

Geotherm Energy

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Deep borehole heat exchangers (DBHEs) with depths exceeding 500 m have been researched comprehensively in the literature, focusing on both applications and subsurface modelling. This review focuses on conventional (vertical) DBHEs and provides a critical literature survey to analyse (i) methodologies for modelling; (ii) results from heat extraction modelling; (iii) results from modelling deep borehole thermal energy storage; (iv) results from heating and cooling models; and (v) real case studies. Numerical models generally compare well to analytical models whilst maintaining more flexibility, but often with increased computational resources. Whilst in-situ geological parameters cannot be readily modified without resorting to well stimulation techniques (e.g. hydraulic or chemical stimulation), engineering system parameters (such as mass flow rate of the heat transfer fluid) can be optimised to increase thermal yield and overall system performance, and minimise pressure drops. In this active research area, gaps remain, such as limited detailed studies into the effects of geological heterogeneity on heat extraction. Other less studied areas include: DBHE arrays, boundary conditions and modes of operation. A small number of studies have been conducted to investigate the potential for deep borehole thermal energy storage (BTES) and an overview of storage efficiency metrics is provided herein to bring consistency to the reporting of thermal energy storage performance of such systems. The modifications required to accommodate cooling loads are also presented. Finally, the active field of DBHE research is generating a growing number of case studies, particularly in areas with low-cost drilling supply chains or abandoned hydrocarbon or geothermal wells suitable for repurposing. Existing and planned projects are thus presented for conventional (vertical) DBHEs. Despite growing interest in this area of research, further work is needed to explore DBHE systems for cooling and thermal energy storage.

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Section: Impact Of Geological Parametersmentioning

confidence: 99%

A comprehensive review of deep borehole heat exchangers (DBHEs): subsurface modelling studies and applications

Kolo,

Brown,

Nibbs

et al. 2024

Geotherm Energy

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“…Reservoir stimulation can be roughly divided into chemical transformation and physical transformation. − Chemical transformation refers to the use of injected solutions to react with the reservoir to increase its permeability. , This process is limited by the mineral composition of the reservoir when it is applied on-site. On the other hand, physical stimulation involves applying pressure to induce damage and fractures in the reservoir, thereby increasing its permeability .…”

Section: Introductionmentioning

confidence: 99%

“…Reservoir stimulation can be roughly divided into chemical transformation and physical transformation. 20 − 23 Chemical transformation refers to the use of injected solutions to react with the reservoir to increase its permeability. 24 , 25 This process is limited by the mineral composition of the reservoir when it is applied on-site.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation Research on Controllable Shock Wave-Induced Shale Fracturing under Repeated Action

Ding,

Liu,

Zhang

et al. 2024

ACS Omega

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Low permeability is a key geological factor constraining the development of shale gas, and reservoir modification to improve its permeability is a prerequisite. Controlled shock wave fracturing can induce the formation of complex fractures in reservoirs and is expected to become an important means of reservoir modification. However, the mechanism of controlled shock wave fracturing in shale and the geological engineering control factors are unclear. Therefore, this article reveals the mechanism and effect of shock wave modification through small-scale experiments and large-scale numerical simulations. Results show that as the impact number increases, a significant increase in large fractures and fracture connectivity within the shale samples is observed, while the correlation between the geometric parameters of the fractures and the number of impacts is weak. High-energy input in the model will cause a larger range of damage to the rock, accompanied by a smaller attenuation index, indicating that the speed of energy attenuation plays a decisive role in rock damage. The influence of crustal stress is greater than the speed of energy attenuation, and higher crustal stress will inhibit the formation of fractures. A moderate increase in the number of controllable shock waves is beneficial for the fracturing effect; however, further increasing the loading number of controllable shock waves will weaken the strengthening effect of the fracturing effect.

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Evolution characteristic and mechanism of microstructure, hydraulic and mechanical behaviors of sandstone treated by acid-rock reaction: Application of in-situ leaching of uranium deposits

Hu,

Niu,

Yuan

et al. 2024

Journal of Hydrology

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Multifactor analysis of heat extraction performance of coaxial heat exchanger applied to hot dry rock resources exploration: A case study in matouying uplift, Tangshan, China

Cited by 4 publications

References 52 publications

A comprehensive review of deep borehole heat exchangers (DBHEs): subsurface modelling studies and applications

A comprehensive review of deep borehole heat exchangers (DBHEs): subsurface modelling studies and applications

Experimental and Numerical Simulation Research on Controllable Shock Wave-Induced Shale Fracturing under Repeated Action

Evolution characteristic and mechanism of microstructure, hydraulic and mechanical behaviors of sandstone treated by acid-rock reaction: Application of in-situ leaching of uranium deposits

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