Analysis of THM Coupling Process in Fracture Networks During Heat Extraction from Hot Dry Rock Using SC-CO<sub>2</sub>

QIAO Mingheng; JING Zefeng; ZHOU Yujuan; WANG Lichao; ZHENG Long

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Analysis of THM Coupling Process in Fracture Networks During Heat Extraction from Hot Dry Rock Using SC-CO₂

更新时间：2025-09-29

- Analysis of THM Coupling Process in Fracture Networks During Heat Extraction from Hot Dry Rock Using SC-CO₂
- JOURNAL OF XI’AN JIAOTONG UNIVERSITY (2025)
- 作者机构：
  
  西安交通大学能源与动力工程学院,陕西省西安市710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK 521.1
- Received：13 July 2025，
  
  Revised：2025-09-16，
  
  Accepted：29 September 2025，
- 稿件说明：
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QIAO Mingheng, JING Zefeng, ZHOU Yujuan, et al. Analysis of THM Coupling Process in Fracture Networks During Heat Extraction from Hot Dry Rock Using SC-CO₂[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2025.
DOI：

QIAO Mingheng, JING Zefeng, ZHOU Yujuan, et al. Analysis of THM Coupling Process in Fracture Networks During Heat Extraction from Hot Dry Rock Using SC-CO₂[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2025. DOI：

摘要

针对使用超临界二氧化碳(SC-CO

)开发干热岩深层地热能时，裂隙储层在多物理场耦合作用下的特性演变规律，以及裂隙网络连通性对热采性能影响不明确的问题。本文使用数值模拟的方法探究了裂隙储层网络的热流固(THM)耦合作用，并且模拟了不同压裂工况下裂隙网络的热采过程。研究对比了SC-CO

与水作为工作介质的取热效果，探究储层特性演变规律，分析了裂隙网络连通性对各物理场和储层特性的影响。研究结果表明：SC-CO

较水具有更高的生产温度和更缓的温度下降趋势，且对储层位移影响更小，更适合长期开采；多条水力裂隙网络的生产温度比单条水力裂隙网络的生产温度高出约24 K；单条水力裂隙网络中，断路距离增加会延缓温度下降但增大压力损失，而多条水力裂隙网络中，断路会减少换热面积并降低换热量，但不影响热突破时间；储层孔隙度、渗透率及裂隙开度受THM耦合作用显著，井眼附近因流体压力梯度导致裂隙开度变化剧烈。本研究为增强型地热系统中裂隙网络优化及高效热采提供理论依据。

Abstract

This paper addresses the unclear issues regarding the evolution law of the properties of fractured reservoirs under the coupling effect of multiple physical fields and the impact of fracture network connectivity on heat extraction performance when supercritical carbon dioxide (SC-CO

) is used to develop deep geothermal energy in hot dry rocks (HDR). This paper adopts the numerical simulation method to investigate the thermal-hydraulic-mechanical (THM) coupling effect of fractured reservoir networks and simulates the heat extraction process of fracture networks under different fracturing conditions. This study compares the heat extraction effects of SC-CO

and water as working fluids

explores the evolution law of reservoir properties

and analyzes the influence of fracture network connectivity on various physical fields and reservoir properties. The results show that SC-CO

has a higher production temperature

a slower temperature decline trend

and a smaller impact on reservoir displacement compared with water

making it more suitable for long-term extraction. The production temperature of the multi-hydraulic fracture network is approximately 24 K higher than that of the single-hydraulic fracture network. In the single hydraulic fracture network

an increase in the disconnection distance delays the temperature drop but increases pressure loss; while in t

he multi-hydraulic fracture network

disconnection reduces the heat exchange area and total heat exchange

but does not affect the thermal breakthrough time. Reservoir porosity

permeability

and fracture aperture are significantly affected by THM coupling. The fracture aperture near the wellbore changes drastically due to the strong fluid pressure gradient. This study provides a theoretical basis for the optimization of fracture networks and efficient heat extraction in EGS.

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Related Institution

School of Energy and Power Engineering, Xi'an Jiaotong University

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西安交通大学能源与动力工程学院，710049，西安School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China

中国船舶集团有限公司第七一一研究所，201108，上海Shanghai Marine Diesel Engine Research Institute, Shanghai 201108, China

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Analysis of THM Coupling Process in Fracture Networks During Heat Extraction from Hot Dry Rock Using SC-CO2

DOI：

摘要

Abstract

关键词

Keywords

references

Analysis of THM Coupling Process in Fracture Networks During Heat Extraction from Hot Dry Rock Using SC-CO₂