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Evaluation of heat extraction performance for vertical multi-fractures in enhanced geothermal system.

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Title: Evaluation of heat extraction performance for vertical multi-fractures in enhanced geothermal system.
Authors: Xu, Fuqiang1,2 (AUTHOR), Ma, Tianshou2 (AUTHOR) matianshou@126.com, Tang, Yijia2 (AUTHOR), Song, Xianzhi1 (AUTHOR), Shi, Yu1,3 (AUTHOR)
Source: Energy Sources Part A: Recovery, Utilization & Environmental Effects. 2025, Vol. 47 Issue 1, p9215-9236. 22p.
Subjects: Heat transfer fluids, Geothermal resources, Heat transfer, Analytical solutions, Heating
Abstract: Enhanced geothermal system (EGS) is an important heat extraction method for geothermal energy of hot dry rocks (HDRs). With the development of directional well and multilateral well technologies, EGS with vertical multi-fractures may be a greatly potential heat extraction method. However, the previous studies mainly focused on the analytical model for single fracture or numerical simulation for complex fractures, while the analytical models for the fluid flow and heat transfer in the EGS with vertical multi-fractures are seldom investigated. Therefore, a fluid flow-heat transfer analytical model was first proposed for vertical multi-fractures in the EGS. Then, the analytical solution of the multi-fractures system was obtained. The model was verified with both analytical and numerical models. In addition, the influence of parameters on the instantaneous heat extraction efficiency was analyzed. The results indicated that the fracture aperture, fluid initial temperature, fluid density, and rock initial temperature have a significant impact on the instantaneous heat extraction efficiency. In the research scope of this paper, when the development time exceeds 5000 days, the instantaneous heat extraction efficiency difference generally exceeds 10.0%, and some parameters can even reach 25.0%. The vertical multi-fracture instantaneous heat extraction efficiency is more than 5.0% higher than the horizontal multi-fracture under the same conditions. The present model can be used to guide the evaluation of instantaneous heat extraction efficiency for EGS with vertical multi-fractures. [ABSTRACT FROM AUTHOR]
Copyright of Energy Sources Part A: Recovery, Utilization & Environmental Effects is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 185818522
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: Evaluation of heat extraction performance for vertical multi-fractures in enhanced geothermal system.
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  Data: <searchLink fieldCode="AR" term="%22Xu%2C+Fuqiang%22">Xu, Fuqiang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ma%2C+Tianshou%22">Ma, Tianshou</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> matianshou@126.com</i><br /><searchLink fieldCode="AR" term="%22Tang%2C+Yijia%22">Tang, Yijia</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Song%2C+Xianzhi%22">Song, Xianzhi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shi%2C+Yu%22">Shi, Yu</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Energy+Sources+Part+A%3A+Recovery%2C+Utilization+%26+Environmental+Effects%22">Energy Sources Part A: Recovery, Utilization & Environmental Effects</searchLink>. 2025, Vol. 47 Issue 1, p9215-9236. 22p.
– Name: Subject
  Label: Subjects
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  Data: <searchLink fieldCode="DE" term="%22Heat+transfer+fluids%22">Heat transfer fluids</searchLink><br /><searchLink fieldCode="DE" term="%22Geothermal+resources%22">Geothermal resources</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+transfer%22">Heat transfer</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+solutions%22">Analytical solutions</searchLink><br /><searchLink fieldCode="DE" term="%22Heating%22">Heating</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Enhanced geothermal system (EGS) is an important heat extraction method for geothermal energy of hot dry rocks (HDRs). With the development of directional well and multilateral well technologies, EGS with vertical multi-fractures may be a greatly potential heat extraction method. However, the previous studies mainly focused on the analytical model for single fracture or numerical simulation for complex fractures, while the analytical models for the fluid flow and heat transfer in the EGS with vertical multi-fractures are seldom investigated. Therefore, a fluid flow-heat transfer analytical model was first proposed for vertical multi-fractures in the EGS. Then, the analytical solution of the multi-fractures system was obtained. The model was verified with both analytical and numerical models. In addition, the influence of parameters on the instantaneous heat extraction efficiency was analyzed. The results indicated that the fracture aperture, fluid initial temperature, fluid density, and rock initial temperature have a significant impact on the instantaneous heat extraction efficiency. In the research scope of this paper, when the development time exceeds 5000 days, the instantaneous heat extraction efficiency difference generally exceeds 10.0%, and some parameters can even reach 25.0%. The vertical multi-fracture instantaneous heat extraction efficiency is more than 5.0% higher than the horizontal multi-fracture under the same conditions. The present model can be used to guide the evaluation of instantaneous heat extraction efficiency for EGS with vertical multi-fractures. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Energy Sources Part A: Recovery, Utilization & Environmental Effects is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1080/15567036.2021.1945712
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 22
        StartPage: 9215
    Subjects:
      – SubjectFull: Heat transfer fluids
        Type: general
      – SubjectFull: Geothermal resources
        Type: general
      – SubjectFull: Heat transfer
        Type: general
      – SubjectFull: Analytical solutions
        Type: general
      – SubjectFull: Heating
        Type: general
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      – TitleFull: Evaluation of heat extraction performance for vertical multi-fractures in enhanced geothermal system.
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            NameFull: Xu, Fuqiang
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            NameFull: Ma, Tianshou
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            NameFull: Tang, Yijia
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            NameFull: Song, Xianzhi
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            NameFull: Shi, Yu
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            – D: 01
              M: 01
              Text: 2025
              Type: published
              Y: 2025
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            – TitleFull: Energy Sources Part A: Recovery, Utilization & Environmental Effects
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