石油钻采工艺2025，Vol.47Issue(6)：739-747,9.DOI:10.13639/j.odpt.202506028
缝内暂堵裂缝扩展应力场与渗流场耦合机理
Coupling mechanism of fracture propagation stress field and seepage field in intra-fracture temporary plugging
摘要
Abstract
To address the complex mechanisms of fracture propagation and stress field redistribution during intra-fracture temporary plugging in naturally fractured tight reservoirs,based on the geomechanical characteristics of the fractured tight reservoirs in Xinjiang Oilfield,this study established a mathematical model for the stress field induced by hydraulic fractures and analyzed the stress distribution patterns around the fractures prior to temporary plugging.Finite element simulations were conducted to investigate the stress redistribution process associated with different propagation scenarios,including single hydraulic fracture,fracture intersection,and secondary diversion of natural fractures.The initiation mechanism of new fractures and the evolution law of the stress field during the intra-fracture temporary plugging were systematically investigated.The results show that dual-field superposition effect induces local stress vector diversion,thereby remarkably enhancing the potential of fracture diversion and propagation.The intersection of hydraulic fractures with natural fractures and secondary diversion trigger the second and third stress redistributions,respectively,regulating the activation and diversion of natural fractures and branch fractures.The pore pressure increase due to temporary plugging can significantly enhance the local stress concentration,thereby evidently boosting stress perturbation and accelerating fracture initiation,propagation,and diversion.The numerical model established for fracture propagation during intra-fracture temporary plugging and multi-field coupling analysis method provide theoretical guidance for the design of field-scale temporary plugging and diversion fracturing operations.关键词
缝内暂堵/应力场重分布/孔隙压力/天然裂缝转向/多场耦合Key words
intra-fracture temporary plugging/stress field redistribution/pore pressure/natural fracture diversion/multiple-field coupling分类
能源科技引用本文复制引用
LYU Zhenhu,LIANG Tianbo,XIAO Zuxing,ZONG Ruiqi,ZHANG Yupeng..缝内暂堵裂缝扩展应力场与渗流场耦合机理[J].石油钻采工艺,2025,47(6):739-747,9.基金项目
新疆维吾尔自治区"天山英才"培养计划"致密油藏集团井网压驱控制机理及智能优化技术"(编号:2024TSYCJC0010). （编号:2024TSYCJC0010）
