中国石油大学学报（自然科学版）2025，Vol.49Issue(4)：86-94,9.DOI:10.3969/j.issn.1673-5005.2025.04.009
热流固-损伤多场耦合作用下干热岩水力压裂特征数值模拟
Numerical simulation of hydraulic fracture characteristics in hot dry rock under thermal-hydraulic-mechanical-damage coupling effects
摘要
Abstract
Hydraulic fracturing serves as a critical pathway for the efficient development of dry hot rock resources,and its core process involves the injection of low-temperature and high-pressure fluids into high-temperature,high-stress rock formations,in which cold shock-induced thermal stress can play a vital role in fracture initiation and propagation within the hot dry rock.However,the evolution characteristics of stress/temperature and fracture propagation patterns in high-temperature rock matrix under coupled thermo-stress interactions remain unclear.In this study,a thermo-hydro-mechanical-damage coupled fracture propagation model was established,incorporating wellbore stress superposition effects,rock thermo-poroelastic responses,elas-tic-brittle failure criteria and permeability-porosity variations with matrix damage.The model̍s accuracy was validated through comparisons with the results of analytical solutions for wellbore cooling and fracture propagation.Numerical simulations under varying geothermal stress conditions and fluid injection temperature reveal that,during fracture initiation,strong thermal stres-ses near the wellbore can promote multi-directional fracture extension,while the subsequent propagation becomes increasingly dominated by in-situ stress distribution,causing fracture reorientation towards the maximum principal stress direction,while the variation of temperature is localized near the wellbore region.Larger temperature differentials can enhance thermal stresses,re-duce initiation pressures and facilitate the development of complex fracture networks.Smaller in-situ stress differentials(under constant maximum principal stress)can weaken the control of fracture initiation/propagation directions by stress field,promo-ting the formation of complex fracture networks while inducing greater stress perturbations.关键词
干热岩/水力压裂/热流固-损伤耦合模型/热应力/地应力差/破裂压力/裂缝扩展模式Key words
hot dry rock/hydraulic fracturing/thermal-hydraulic-mechanical-damage coupling model/thermal stress/in-situ differential stress/breakdown pressure/fracture propagation patterns分类
能源科技引用本文复制引用
张旭,周小夏,黄中伟,李根生,王天宇,武晓光..热流固-损伤多场耦合作用下干热岩水力压裂特征数值模拟[J].中国石油大学学报（自然科学版）,2025,49(4):86-94,9.基金项目
国家自然科学基金重点国际(地区)合作与交流项目(52020105001) （地区）
国家自然科学基金青年科学基金项目(5230040287) （5230040287）
国家自然科学基金重大项目(52192621) （52192621）
中国博士后科学基金项目(2023M743877) （2023M743877）
