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Journal of Thermal Science

热科学学报

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2022 , Vol. 31 >Issue 3: 946 - 957

DOI: https://doi.org/10.1007/s11630-022-1598-5

流体机械

Water Storage of Water-Based Enhanced Geothermal System Based on a 3D Thermal-Hydrologic-Mechanical Model

  • WANG Changlong ,
  • HUANG Xinjie ,
  • TANG Gang ,
  • ZHONG Dan
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  • 1. School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China
    2. Zhuhai Da Hengqin Science and Technology Development Co., Ltd, Zhuhai 519000, China
    3. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China

网络出版日期: 2023-12-01

基金资助

The authors would like to thank Anhui Provincial Natural Science Foundation (1808085QE178) and China Postdoctoral Science Foundation (2018M640536) for the financial support.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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Water Storage of Water-Based Enhanced Geothermal System Based on a 3D Thermal-Hydrologic-Mechanical Model

  • WANG Changlong ,
  • HUANG Xinjie ,
  • TANG Gang ,
  • ZHONG Dan
Expand
  • 1. School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China
    2. Zhuhai Da Hengqin Science and Technology Development Co., Ltd, Zhuhai 519000, China
    3. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China

Online published: 2023-12-01

Supported by

The authors would like to thank Anhui Provincial Natural Science Foundation (1808085QE178) and China Postdoctoral Science Foundation (2018M640536) for the financial support.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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摘要

在以水为工质的增强型地热系统（EGS）中，存在传热-流动-力学（THM）耦合过程，而这将会极大地影响EGS热开采性能。尽管目前提出了很多THM模型，但是现有研究缺乏对水储存（由储层孔隙率和水的密度的增大而引起）的深入分析，并且水储存对热开采性能的影响还有待揭示。为此，本文建立了一个三维THM模型，用于模拟EGS的水储存量和热开采速率。通过一个分析解对该三维THM模型进行了验证。然后，研究了水储存的影响，并对不同储层孔隙率条件下的THM和TH过程进行了对比。结果显示储层孔隙率增大对水储存的影响高于水的密度的增大。如果忽略水储存，那么注入流量将会被低估，产出流量和热开采速率将会被高估，并且储层冷却速率稍微减小。与TH过程相比，THM过程会导致更大的水储存量、更高的稳态热开采速率和更高的储层冷却速率，这说明力学过程对EGS性能具有重要影响。初始储层孔隙率越高，那么水储存量越大。可以推断出水储存量与储层冷却速率相关。本文结果显示水储存对热开采速率有一定的影响，而力学过程和初始储层孔隙率对水储存量有重要影响，因而水储存量应该采用THM模型进行模拟。

关键词： enhanced geothermal system; thermal-hydrologic-mechanical model; heat extraction; water storage

本文引用格式

WANG Changlong , HUANG Xinjie , TANG Gang , ZHONG Dan . Water Storage of Water-Based Enhanced Geothermal System Based on a 3D Thermal-Hydrologic-Mechanical Model[J]. 热科学学报, 2022 , 31(3) : 946 -957 . DOI: 10.1007/s11630-022-1598-5

Abstract

The thermal-hydrologic-mechanical (THM) coupled processes in water-based enhanced geothermal system (EGS) greatly influence the heat extraction performance of EGS. Many THM models have been proposed, however, there is a lack of detailed analysis of water storage, which is caused by the increments of reservoir porosity and water density, and the influence of water storage on the heat extraction performance needs to be uncovered. In this paper, a 3D THM model is established to simulate the water storage amount and heat extraction rate for a water-based EGS. The 3D THM model is verified against an analytical solution. Then, the influences of water storage are investigated, and comparisons between the THM and thermal-hydrologic (TH) processes are made for different initial reservoir porosities. The results show that the increment of reservoir porosity has a larger influence on water storage than that of water density. If ignoring water storage, the injection flow rate would be underestimated, while the production flow rate and heat extraction rate would be overestimated, and the reservoir would be cooled a little slower. Compared with the TH processes, the THM processes show larger cumulative water storage amount, higher steady-state heat extraction rate and higher cooling rate of reservoir, indicating that mechanical process has important influences on EGS performances. For higher initial reservoir porosity, the cumulative water storage amount is larger. It can be inferred that the water storage amount is related to the cooling rate of reservoir. The results of this paper show that water storage has a certain influence on the heat extraction rate, and that the mechanical process and initial reservoir porosity have important effects on the water storage amount, which should be simulated based on a THM model.

Key words： enhanced geothermal system; thermal-hydrologic-mechanical model; heat extraction; water storage

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