焊管2025，Vol.48Issue(11)：35-45,11.DOI:10.19291/j.cnki.1001-3938.2025.11.005
基于失效评估图的S13Cr油管裂纹安全评定研究
Study on Safety Assessment of S13Cr Tubing Cracks based on Failure Assessment Diagram
摘要
Abstract
To address the issue of surface crackinduced by failure of S13Cr tubing in deep and ultra-deep wells under high-temperature and heavy-load conditions,a safety assessment study was conducted based on the Failure Assessment Diagram(FAD).Mechanical parameters and thermal expansion coefficients of S13Cr at 40℃,80℃,120℃,and 160℃were obtained through uniaxial tensile and thermal expansion tests,and the constitutive parameters of S13Cr were derived.A three-dimensional finite element model of Φ88.9 mm S13Cr tubing was established to calculate the stress intensity factor and plastic limit load of circumferential cracks.The failure assessment curve was determined based on the R6 Code,and the safety assessment was completed using the fracture ratio(Kr)and load ratio(Lr).The results show that under the working conditions of an 800 kN axial tensile force and a 30 MPa pressure difference,the assessment points of S13Cr tubing with crack depths ratio(a/t)of 0.3～0.7 and crack shape ratios(a/c)of 0.8～1.2 all lie within the safe zone of the FAD.关键词
S13Cr油管/表面裂纹/失效评估图/应力强度因子/临界裂纹尺寸Key words
S13Cr tubing/surface crack/FAD/stress intensity factor/critical crack size分类
石油、天然气工程引用本文复制引用
姚力萍,曹敏,张开强,钟翔,唐丽,汤历平..基于失效评估图的S13Cr油管裂纹安全评定研究[J].焊管,2025,48(11):35-45,11.基金项目
中国石油集团公司前瞻性基础性科技项目"深层/超深层油气藏开发技术研究"(项目编号2021DJ1006). （项目编号2021DJ1006）
