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Efficient workflow for simulation of multifractured enhanced geothermal systems (EGS)

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  • Asai, Pranay
  • Panja, Palash
  • McLennan, John
  • Moore, Joseph

Abstract

The increasing demand for clean energy with minimum environmental impact motivates development of geothermal energy. Simulating a geothermal reservoir is complex and time consuming, mainly because of the systems spatial and temporal non-isothermal nature and the enormous size of the domain/reservoir. Simulations become even more complex when representing Enhanced Geothermal Systems (EGS), where wells in a hot, low permeability reservoir are interconnected by hydraulic fracturing to provide pathways for injection of cold water, in situ heating, and consequent production of hot water. In this study, various issues related to simulation of enhanced geothermal systems are investigated and practical solutions are proposed. A comprehensive study was conducted to show the effect of different grid systems on predictions of the transient temperature of the produced water. It is shown that the performance of an EGS is affected by the transmissivity (product of permeability and width of the fracture) of the fracture more so than by the values of permeability and width of the fracture considered individually. A simplified model (downscaled model) reduces the simulation times significantly (by 1.5–14.5 times) without compromising the accuracy of the results. In the proposed model, only two simulations - capturing small portions of the top and bottom of a reservoir with two active hydraulic fractures is used to evaluate performance of the entire reservoir. The proposed model is proved to be robust when exposed to different scenarios created by varying the inclination of the wells with respect to horizontal, spacing of the hydraulic factures, and spacing between the injection and producing wells. Value of R2 close to unity (0.96–1.0) and smaller value of MAPE (Mean Absolute Percentage Error), less than 3% in comparison to the entire reservoir simulations, indicate the utility of proposed model.

Suggested Citation

  • Asai, Pranay & Panja, Palash & McLennan, John & Moore, Joseph, 2019. "Efficient workflow for simulation of multifractured enhanced geothermal systems (EGS)," Renewable Energy, Elsevier, vol. 131(C), pages 763-777.
    • Handle: RePEc:eee:renene:v:131:y:2019:i:c:p:763-777
    DOI: 10.1016/j.renene.2018.07.074
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    References listed on IDEAS

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    6. Hu, Xincheng & Banks, Jonathan & Guo, Yunting & Liu, Wei Victor, 2022. "Utilizing geothermal energy from enhanced geothermal systems as a heat source for oil sands separation: A numerical evaluation," Energy, Elsevier, vol. 238(PA).
    7. Asai, Pranay & Panja, Palash & McLennan, John & Deo, Milind, 2019. "Effect of different flow schemes on heat recovery from Enhanced Geothermal Systems (EGS)," Energy, Elsevier, vol. 175(C), pages 667-676.
    8. Ma, Weiwu & Wang, Yadan & Wu, Xiaotian & Liu, Gang, 2020. "Hot dry rock (HDR) hydraulic fracturing propagation and impact factors assessment via sensitivity indicator," Renewable Energy, Elsevier, vol. 146(C), pages 2716-2723.
    9. 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).
    10. Linkai Li & Xiao Guo & Ming Zhou & Gang Xiang & Ning Zhang & Yue Wang & Shengyuan Wang & Arnold Landjobo Pagou, 2021. "The Investigation of Fracture Networks on Heat Extraction Performance for an Enhanced Geothermal System," Energies, MDPI, vol. 14(6), pages 1-18, March.
    11. Dong Zhu & Yuqing Fan & Xiaofei Liu & Xiangling Tao & Liegang Miao & Huiwu Jin, 2022. "Characteristics of Acoustic Emission Response during Granite Splitting after High Temperature-Water Cooling Cycles," Sustainability, MDPI, vol. 14(20), pages 1-16, October.
    12. Xue, Zhenqian & Zhang, Kai & Zhang, Chi & Ma, Haoming & Chen, Zhangxin, 2023. "Comparative data-driven enhanced geothermal systems forecasting models: A case study of Qiabuqia field in China," Energy, Elsevier, vol. 280(C).
    13. Ma, Yuanyuan & Li, Shibin & Zhang, Ligang & Liu, Songze & Liu, Zhaoyi & Li, Hao & Shi, Erxiu, 2020. "Study on the effect of well layout schemes and fracture parameters on the heat extraction performance of enhanced geothermal system in fractured reservoir," Energy, Elsevier, vol. 202(C).
    14. Akdas, Satuk Bugra & Onur, Mustafa, 2022. "Analytical solutions for predicting and optimizing geothermal energy extraction from an enhanced geothermal system with a multiple hydraulically fractured horizontal-well doublet," Renewable Energy, Elsevier, vol. 181(C), pages 567-580.
    15. Xiang Gao & Tailu Li & Yao Zhang & Xiangfei Kong & Nan Meng, 2022. "A Review of Simulation Models of Heat Extraction for a Geothermal Reservoir in an Enhanced Geothermal System," Energies, MDPI, vol. 15(19), pages 1-23, September.
    16. Gao, Xiang & Li, Tailu, 2022. "Synergetic characteristics of three-dimensional transient heat transfer in geothermal reservoir combined with power conversion for enhanced geothermal system," Renewable Energy, Elsevier, vol. 192(C), pages 216-230.
    17. Guo, Tiankui & Tang, Songjun & Sun, Jiang & Gong, Facheng & Liu, Xiaoqiang & Qu, Zhanqing & Zhang, Wei, 2020. "A coupled thermal-hydraulic-mechanical modeling and evaluation of geothermal extraction in the enhanced geothermal system based on analytic hierarchy process and fuzzy comprehensive evaluation," Applied Energy, Elsevier, vol. 258(C).
    18. Asai, Pranay & Podgorney, Robert & McLennan, John & Deo, Milind & Moore, Joseph, 2022. "Analytical model for fluid flow distribution in an Enhanced Geothermal Systems (EGS)," Renewable Energy, Elsevier, vol. 193(C), pages 821-831.
    19. Aliyu, Musa D. & Archer, Rosalind A., 2021. "Numerical simulation of multifracture HDR geothermal reservoirs," Renewable Energy, Elsevier, vol. 164(C), pages 541-555.
    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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