Application of a thermal transient subsurface model to a coaxial borehole heat exchanger system

Abdelhafiz, Mostafa M.; Oppelt, Joachim; Brenner, Günther; Hegele, Luiz A.

doi:10.1016/j.geoen.2023.211815

Cited by 4 publications

(3 citation statements)

References 36 publications

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“…To ensure the reliability and applicability of our model across various regions, we have undertaken rigorous validation efforts. The numerical solution has been validated using theoretical methods, computational methods and employing a comparison with the field and experimental data obtained from geothermal wells in Mexico, Norway, and Sweden (Abdelhafiz et al, 2023). The comparisons have consistently demonstrated good agreement between our model predictions and the observed data (Abdelhafiz, 2022).…”

Section: Governing Equationmentioning

confidence: 73%

Effect of drilling and wellbore geometry parameters on wellbore temperature profile: Implications for geothermal production

Abdelhafiz

Oppelt

Mahmoud

et al. 2023

Adv. Geo-Energy Res.

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Prediction of the wellbore fluids and formation temperatures is crucial during drilling operation, especially for high temperature wells, such as geothermal applications. This work presents the applications of an improved comprehensive drilling simulator for predicting the wellbore system temperature during the drilling process. A fully transient numerical model of the wellbore temperature is developed for drilling and geothermal production applications. The model describes the dynamic behaviour of the thermal state of the wellbore during circulation and static conditions. The developed model is implemented with the commercial virtual drilling simulator through an application programming interface. This implementation allows the coupling of the thermal model with other physical models, which leads to more advanced and realistic simulations. The model has been previously validated through a direct comparison with field data from geothermal well located in the Hanover area in Germany. The results showed a good agreement between the predicted outlet fluid temperature and the measured one. Furthermore, an analysis of the effect of various parameters on the wellbore system temperature is performed. This analysis showed the impact of these parameters on the wellbore temperature profile including the critical areas such as the casing setting point and bottom hole assembly. This information may lead to enhancing the wellbore stability by monitoring the thermal stresses, especially in high-temperature wells. Moreover, predicting the drill bit temperature can result in increasing the lifetime of the bit by adjusting the operating conditions to keep the bit temperature within the specified range. Based on these results, the enhanced drilling simulator with the transient temperature model showed to be a suitable tool for effective well planning.

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Section: Governing Equationmentioning

confidence: 73%

Effect of drilling and wellbore geometry parameters on wellbore temperature profile: Implications for geothermal production

Abdelhafiz

Oppelt

Mahmoud

et al. 2023

Adv. Geo-Energy Res.

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“…These characteristics will impact both thermal (e.g. Abdelhafiz et al (2023)) and hydraulic performance (e.g. Morchio and Fossa (2019)).…”

Section: Impact Of Engineering 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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“…Mostafa M. Abdelhafiz et al presented an application of a thermal transient model to a coaxial borehole heat exchanger system. The results showed that the reverse circulation had a better heat extraction, while regular flow performed better in the case of heat injection [17]. Taha Rajeh et al introduced a detailed comparative numerical study on a novel CGHE with an oval cross-section for enhancing the performance of the GCHP.…”

Section: Introductionmentioning

confidence: 99%

Research on the Heat Extraction Performance Optimization of Spiral Fin Coaxial Borehole Heat Exchanger Based on GA–BPNN–QLMPA

Fu,

Guo,

Yan

et al. 2023

Processes

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Geothermal energy, a renewable energy source with enormous reserves independent of the external environment, is essential for reducing carbon emissions. Spiral fin coaxial borehole heat exchanger (SFCBHE) is vital for geothermal energy extraction. Its heat extraction performance requires further improvements for efficient performance that consider the structural sizes and installation positions of the SFCBHE and the nonlinear coupling with respect to several factors. The heat extraction performance of SFCBHE is optimized using a combination of genetic algorithm–back-propagation neural network (GA–BPNN) and the Q-learning-based marine predator algorithm (QLMPA). This study analyzes and compares the effects of geothermal energy extraction of smooth pipe TY-1, structure before optimization TY-2, and optimized structure TY-3. Following optimization with GA–BPNN–QLMPA, the heat extraction performance of TY-3 is enhanced by 30.8% and 23.6%, respectively. The temperature of maximum extraction is improved by 26.8 K and 24.0 K, respectively. The power of maximum heat extraction is increased by 148.2% and 109.5%, respectively. The optimization method can quickly and accurately determine the heat extraction performance for different structural sizes and installation positions of the SFCBHE. These findings are crucial for developing high-performance SFCBHE and efficiently using geothermal energy.

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Application of a thermal transient subsurface model to a coaxial borehole heat exchanger system

Cited by 4 publications

References 36 publications

Effect of drilling and wellbore geometry parameters on wellbore temperature profile: Implications for geothermal production

Effect of drilling and wellbore geometry parameters on wellbore temperature profile: Implications for geothermal production

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

Research on the Heat Extraction Performance Optimization of Spiral Fin Coaxial Borehole Heat Exchanger Based on GA–BPNN–QLMPA

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