TY  - EJOU
AU  - Liu, Zhuang 
AU  - Fan, Tingen 
AU  - Lu, Qianli 
AU  - Guo, Jianchun 
AU  - Yang, Renfeng 
AU  - Wang, Haifeng 

TI  - Modeling of Thermal Shock-Induced Fracture Propagation Based on Phase-Field Approach
T2  - Fluid Dynamics \& Materials Processing

PY  - 2025
VL  - 21
IS  - 4
SN  - 1555-2578

AB  - 
Thermal shock damage in deep shale hydraulic fracturing can impact fracture propagation behaviors, potentially leading to the formation of complex fractures and enhancing gas recovery. This study introduces a thermal-hydraulic-mechnical (THM) coupled fracture propagation model relying on the phase field method to simulate thermal shock-induced fracturing in the deep shale considering dynamic temperature conditions. The validity of this model is confirmed through comparison of experimental and numerical results concerning the THM-coupled stress field and thermal cracking. Special attention is paid to the interaction of thermal shock-induced fractures in deep shale that contains weak planes. The results indicate that thermal shock-induced stress significantly amplifies the tensile stress range and deteriorates rock strength, resulting in a multi-point failure pattern within a fracture. The thermal shock damage degree is closely related to the fracture cooling efficiency, suggesting that considering downhole temperature conditions in THM-coupled fracture stress field calculations is advisable. Thermal shock can activate pre-existing natural fractures and enhance the penetration ability of hydraulic fractures, thereby leading to a fracture network.
KW  - Thermal shock; hydraulic fracturing; THM-coupled; induced stress; PFM modeling

DO  - 10.32604/fdmp.2024.056729