钻探工程2026，Vol.53Issue(1)：52-58,7.DOI:10.12143/j.ztgc.2026.01.008
基于3D有限元仿真的钻杆接头应力分析与集中系数研究
Stress analysis and concentration coefficient of drill pipe joints based on 3D finite element simulation
摘要
Abstract
In drilling engineering,failures at the threaded connections of drill pipe joints account for up to 86%,making them the primary risk area for drill string failure.To conduct an in-depth analysis of joint stress distribution and concentration characteristics,this study,based on 3D finite element simulation,performed a comparative analysis of the stress in API standard single-shoulder and double-shoulder drill string joints under axial and torsional loads.Furthermore,the axial and torsional stress concentration coefficients for the NC50-type joint were calculated.The findings indicate that:the maximum stress in single-shoulder threads is concentrated at the root of the first thread in the thread engagement area;the maximum axial and shear stresses in double-shoulder threads are significantly lower than those in single-shoulder threads,with reductions of approximately 24%and 27.3%,respectively,exhibiting a more pronounced performance advantage,especially under high torque;the axial stress concentration coefficient for the NC50 joint is 4.21,and the torsional stress concentration coefficient is 3.73.The outcomes of this research provide a significant basis for the performance optimization design of drill pipe joints,precise stress calculation of the drilling system,and fatigue life prediction.关键词
钻柱失效/螺纹连接/应力集中系数/疲劳失效/有限元分析/结构优化Key words
drill string failure/threaded connection/stress concentration coefficient/fatigue failure/finite element analysis/structural optimization分类
能源科技引用本文复制引用
张旺,何胜煜,卜长根..基于3D有限元仿真的钻杆接头应力分析与集中系数研究[J].钻探工程,2026,53(1):52-58,7.基金项目
国家自然科学基金项目"潜孔锤/声波钻钻柱动力学关键问题研究"(编号:51775523) （编号:51775523）
