Numerical Simulation Study on Geothermal Extraction Characteristics of Supercritical CO<sub>2</sub> in Heterogeneous Fractures

XIU Wenheng; CHEN Jie; OU Yongshen; ZHANG Yongmin; WANG Qiuwang; YANG Jian; CHU Wenxiao

doi:10.7652/xjtuxb202605005

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Numerical Simulation Study on Geothermal Extraction Characteristics of Supercritical CO₂ in Heterogeneous Fractures

—————————————————————— | 更新时间：2026-04-27

- Numerical Simulation Study on Geothermal Extraction Characteristics of Supercritical CO₂ in Heterogeneous Fractures
- Journal of Xi'an Jiaotong University Vol. 60, Issue 5, Pages: 48-58(2026)
- 作者机构：
  
  西安交通大学热流科学与工程教育部重点实验室，710049，西安
  西安交通大学电气绝缘与电子设备国家重点实验室，710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202605005
  CLC： TK529
- Received：18 June 2025，
  
  Published：10 May 2026
- 稿件说明：
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XIU Wenheng, CHEN Jie, OU Yongshen, et al. Numerical Simulation Study on Geothermal Extraction Characteristics of Supercritical CO₂ in Heterogeneous Fractures[J]. Journal of Xi'an Jiaotong University, 2026, 60(5): 48-58. DOI: 10.7652/xjtuxb202605005.
DOI：

XIU Wenheng, CHEN Jie, OU Yongshen, et al. Numerical Simulation Study on Geothermal Extraction Characteristics of Supercritical CO₂ in Heterogeneous Fractures[J]. Journal of Xi'an Jiaotong University, 2026, 60(5): 48-58. DOI: 10.7652/xjtuxb202605005. DOI：

摘要

为提升地热系统取热性能，研究了裂隙的异质性对CO

地热系统热提取量的影响。采用数值模拟方法，针对超临界CO

在干热岩异质裂隙中的渗流、传热及取热效果开展研究，探讨裂隙导流特性调控技术（FCTT）的作用机制，并对比调控前后总热能提取量的变化。模拟结果表明：渗透率空间关联长度通过改变渗流网络结构显著影响热提取效率，较大关联长度（

≥0.50 m）易形成固化流道，导致换热区域受限，而较小关联长度（

≤0.33 m）可使低渗透团块均匀离散分布，增强热补偿效果，使热提取过程更均匀；FCTT的调控效果呈现空间异质性，平流区大关联长度工况因长程非均质性仍出现流道固化，而小关联长度体系保持多分支流态，缓解了区域换热失衡；总热能开采量随关联长度减小而增大，当

从1.00 m降至0.20m时，总开采量增长7.05%；FCTT调控对压裂不均匀的裂隙改善效果更显著，在

=1.00 m的大关联长度工况下，1.5个月内的总采热量上升10.66%。研究可为基于超临界CO

工质的地热系统裂隙设计与取热预测提供理论依据。

Abstract

To enhance the heat extraction performance of geothermal systems

the influence of fracture heterogeneity on the heat extraction capacity of CO

-based geothermal systems is investigated. By using numerical simulation methods

the seepage

heat transfer

and heat extraction effects of supercritical CO

in heteroge

neous fractures within hot dry rock were examined. The mechanism of fracture conductivity tuning technology (FCTT) was explored

and changes in total heat extraction before and after tuning were compared. The simulation results show that the spatial correlation length of permeability significantly affects heat extraction efficiency by altering the seepage network structure. Larger correlation lengths (

≥0.50 m) tend to form solidified flow channels

limiting the heat exchange area

whereas smaller correlation lengths (

≤0.33 m) allow low-permeability clusters to be uniformly dispersed

enhancing heat compensation and making the heat extraction process more uniform. The tuning effect of FCTT exhibits spatial heterogeneity：in advection-dominated regions with large

long-range heterogeneity still leads to solidified flow channels

while systems with small

maintain multi-branch flow patterns

alleviating regional heat exchange imbalances. The total heat extraction increases as the correlation length decreases. When

is reduced from 1.00 m to 0.20 m

the total extraction increases by 7.05%. FCTT tuning demonstrates more significant improvements in fractures with uneven fracturing. Under large correlation length conditions (

=1.00 m)

the total heat extraction within 1.5 months increases by 10.66%. This study provides a theoretical basis for fracture design and heat extraction prediction in geothermal systems based on supercritical CO

as the working fluid.

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⁰

Numerical Simulation Study on Geothermal Extraction Characteristics of Supercritical CO2 in Heterogeneous Fractures

DOI：10.7652/xjtuxb202605005

摘要

Abstract

关键词

Keywords

references

Numerical Simulation Study on Geothermal Extraction Characteristics of Supercritical CO₂ in Heterogeneous Fractures