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Heat recovery from multiple-fracture enhanced geothermal systems: The effect of thermoelastic fracture interactions

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  • Slatlem Vik, Hedda
  • Salimzadeh, Saeed
  • Nick, Hamidreza M.

Abstract

This study investigates the effect of thermoelastic interactions between multiple parallel fractures on energy production from a multiple-fracture enhanced geothermal system. A coupled thermo-hydro-mechanical finite element model has been developed that accounts for non-isothermal fluid flow within the fractures, conductive heat transfer in the rock matrix, and the mechanical deformation of the matrix. The model results show that the matrix deformation significantly increases the interactions between the two adjacent fractures. Matrix contraction due to the cooling of the matrix increases the fracture aperture in the adjacent fracture, and facilitates the creation of favourable flow pathways between the injection and production wells. These flow paths reduce the energy production from the system. The effects of fracture spacing, reservoir temperature gradient and mechanical properties of the rock matrix on the production temperature and the net production energy are investigated. It is shown that the spacing calculated based on the assumption of rigid matrix (constant uniform aperture) are too small, and in order to account for the thermoelastic interactions, the spacing between fractures should be further increased to maximise the net energy production from the system. Otherwise, the multiple-fracture system fails to improve the energy recovery from the geothermal reservoir, as initially intended.

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  • Slatlem Vik, Hedda & Salimzadeh, Saeed & Nick, Hamidreza M., 2018. "Heat recovery from multiple-fracture enhanced geothermal systems: The effect of thermoelastic fracture interactions," Renewable Energy, Elsevier, vol. 121(C), pages 606-622.
    • Handle: RePEc:eee:renene:v:121:y:2018:i:c:p:606-622
    DOI: 10.1016/j.renene.2018.01.039
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    References listed on IDEAS

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    Citations

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    Cited by:

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    6. Saeed Mahmoodpour & Mrityunjay Singh & Ramin Mahyapour & Sri Kalyan Tangirala & Kristian Bär & Ingo Sass, 2022. "Numerical Simulation of Thermo-Hydro-Mechanical Processes at Soultz-sous-Forêts," Energies, MDPI, vol. 15(24), pages 1-21, December.
    7. Isaka, B.L. Avanthi & Ranjith, P.G. & Rathnaweera, T.D. & Perera, M.S.A. & Kumari, W.G.P., 2019. "Influence of long-term operation of supercritical carbon dioxide based enhanced geothermal system on mineralogical and microstructurally-induced mechanical alteration of surrounding rock mass," Renewable Energy, Elsevier, vol. 136(C), pages 428-441.
    8. Gao, Xuefeng & Zhang, Yanjun & Huang, Yibin & Ma, Yongjie & Zhao, Yi & Liu, Qiangbin, 2021. "Study on heat extraction considering the number and orientation of multilateral wells in a complex fractured geothermal reservoir," Renewable Energy, Elsevier, vol. 177(C), pages 833-852.
    9. Willems, C.J.L. & M. Nick, H., 2019. "Towards optimisation of geothermal heat recovery: An example from the West Netherlands Basin," Applied Energy, Elsevier, vol. 247(C), pages 582-593.
    10. Song, Guofeng & Song, Xianzhi & Ji, Jiayan & Wu, Xiaoguang & Li, Gensheng & Xu, Fuqiang & Shi, Yu & Wang, Gaosheng, 2022. "Evolution of fracture aperture and thermal productivity influenced by chemical reaction in enhanced geothermal system," Renewable Energy, Elsevier, vol. 186(C), pages 126-142.
    11. Ma, Yuanyuan & Li, Shibin & Zhang, Ligang & Liu, Songze & Liu, Zhaoyi & Li, Hao & Shi, Erxiu & Liu, Xuemei & Liu, Hongliang, 2020. "Analysis on the heat extraction performance of multi-well injection enhanced geothermal system based on leaf-like bifurcated fracture networks," Energy, Elsevier, vol. 213(C).
    12. Salimzadeh, S. & Grandahl, M. & Medetbekova, M. & Nick, H.M., 2019. "A novel radial jet drilling stimulation technique for enhancing heat recovery from fractured geothermal reservoirs," Renewable Energy, Elsevier, vol. 139(C), pages 395-409.
    13. Mahmoodpour, Saeed & Singh, Mrityunjay & Turan, Aysegul & Bär, Kristian & Sass, Ingo, 2022. "Simulations and global sensitivity analysis of the thermo-hydraulic-mechanical processes in a fractured geothermal reservoir," Energy, Elsevier, vol. 247(C).
    14. Ziabakhsh-Ganji, Zaman & Nick, Hamidreza M. & Donselaar, Marinus E. & Bruhn, David F., 2018. "Synergy potential for oil and geothermal energy exploitation," Applied Energy, Elsevier, vol. 212(C), pages 1433-1447.
    15. Liu, Gang & Zhou, Chunwei & Rao, Zhenghua & Liao, Shengming, 2021. "Impacts of fracture network geometries on numerical simulation and performance prediction of enhanced geothermal systems," Renewable Energy, Elsevier, vol. 171(C), pages 492-504.
    16. Shi, Yu & Song, Xianzhi & Wang, Gaosheng & Li, Jiacheng & Geng, Lidong & Li, Xiaojiang, 2019. "Numerical study on heat extraction performance of a multilateral-well enhanced geothermal system considering complex hydraulic and natural fractures," Renewable Energy, Elsevier, vol. 141(C), pages 950-963.
    17. Babaei, Masoud & Nick, Hamidreza M., 2019. "Performance of low-enthalpy geothermal systems: Interplay of spatially correlated heterogeneity and well-doublet spacings," Applied Energy, Elsevier, vol. 253(C), pages 1-1.
    18. Aliyu, Musa D. & Archer, Rosalind A., 2021. "Numerical simulation of multifracture HDR geothermal reservoirs," Renewable Energy, Elsevier, vol. 164(C), pages 541-555.
    19. Abbasi, Mahdi & Mansouri, Mehrshad & Daryasafar, Amin & Sharifi, Mohammad, 2019. "Analytical model for heat transfer between vertical fractures in fractured geothermal reservoirs during water injection," Renewable Energy, Elsevier, vol. 130(C), pages 73-86.
    20. Ma, Yuanyuan & Li, Shibin & Zhang, Ligang & Liu, Songze & Liu, Zhaoyi & Li, Hao & Shi, Erxiu & Zhang, Haijun, 2020. "Numerical simulation study on the heat extraction performance of multi-well injection enhanced geothermal system," Renewable Energy, Elsevier, vol. 151(C), pages 782-795.

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