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Numerical study on fracture propagation of CO2 fracturing in tight sandstone with phase change effect
编号：35
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更新：2025-07-21 16:17:52 浏览：13次
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摘要
Supercritical carbon dioxide (Sc-CO2) fracturing is a developing fracturing technology in the unconventional reservoir stimulation due to its potential to increase production, reduce water requirements, and minimize environmental impacts. Phase changes induced by pressure and temperature variations during cold CO2 injection notably influence fracture initiation and propagation, but are commonly neglected in existing numerical models. In this study, a coupled thermal-hydro-mechanical-damage (THMD) model considering phase change was developed to investigate the fracture initiation and propagation in tight sandstone during Sc-CO2 fracturing. The results show that the initiation time and initiation pressure with phase change decreased by 88.19% and 16.67%, respectively, compared to the case without phase change. This reduction is attribution to mass transfer induced by phase change, which decreases the contribution of pore pressure to the critical stress state while increasing that of thermal stress increases, thereby promoting earlier fracture initiation at a relatively lower pore pressure. Furthermore, phase change enhances both the damage area and the development of branching fractures. This occurs because the combined effects of phase change-induced volumetric expansion, sustained mass transfer, and pressure release at fracture tip intensify the fracture response. As a result, the failure mode shifts from a purely overpressure-driven type without phase change to a pulsatile disturbance type. These findings provide a valuable insight into the effect of phase transition during Sc-CO2 fracturing, thereby laying theoretical base for optimizing fracturing design and evaluating stimulation performance.
关键词
Phase change, CO2 fracturing, fracture propagation, THMD coupling
报告人
改 张
Underground Energy Tongji University稿件作者
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重要日期
-
会议日期
08月23日
2025
至08月26日
2025
-
07月21日 2025
初稿截稿日期
-
08月26日 2025
注册截止日期
主办单位
Southwest Jiaotong University, China (SWJTU)
International Consortium on Geo-disaster Reduction (ICGdR)
UNESCO Chair on Geoenvironmental Disaster Reduction
International Consortium on Geo-disaster Reduction (ICGdR)
UNESCO Chair on Geoenvironmental Disaster Reduction
承办单位
Southwest Jiaotong University, China (SWJTU)
International Consortium on Geo-disaster Reduction (ICGdR)
UNESCO Chair on Geoenvironmental Disaster Reduction
International Consortium on Geo-disaster Reduction (ICGdR)
UNESCO Chair on Geoenvironmental Disaster Reduction
联系方式
- Yufeng Wang
- wa******@swjtu.edu.cn
- +86********
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