焊管2025，Vol.48Issue(11)：28-34,7.DOI:10.19291/j.cnki.1001-3938.2025.11.004
基于热-力耦合的超深井套管失效行为研究
Study on Casing Failure Behavior in Ultra-deep Wells based on Thermo-mechanical Coupling
摘要
Abstract
To analyze the influence of thermo-mechanical coupling on the load-bearing capacity of casing,finite element method was used to analyze the thermo-mechanical coupling response behavior of P110 perforation casing under various conditions,including different internal-external temperature difference gradients,external collapse pressures,and non-uniform loading.Results demonstrate that,under the same magnitude of temperature difference,the yield strength limits of the casing differ by 8.5%between scenarios of heat transfer from inside to outside and from outside to inside,indicating a significant influence of the temperature difference direction on the casing's stress state.The load-bearing capacity of casing decreases significantly as the non-uniform loading coefficient increases.With 80%increase in non-uniform load,the maximum reduction in casing bearing capacity reaches 29.6%.While both increasing temperature difference and enhanced loading non-uniformity exhibit a similar weakening effect on the casing's bearing capacity,their underlying mechanisms exhibit fundamental differences.These findings provide a theroetical and engineering guidance for safety assessment of casings under complex downhole conditions.关键词
超深井/套管强度/射孔/热-力耦合/数值模拟Key words
ultra-deep wells/casing strength/perforation/thermo-mechanical coupling/numerical simulation分类
石油、天然气工程引用本文复制引用
张臣铠,吕畅,曲宝龙,刘少胡,张磊..基于热-力耦合的超深井套管失效行为研究[J].焊管,2025,48(11):28-34,7.基金项目
国家科技重大专项课题"连续管装备与应用技术"(项目编号2011ZX05036-006). （项目编号2011ZX05036-006）
