石油与天然气化工2025，Vol.54Issue(5)：74-81,8.DOI:10.3969/j.issn.1007-3426.2025.05.009
多载荷耦合的特高压井口法兰力学响应特性分析
Analysis of the mechanical response characteristics of multi-load coupled ultra-high pressure wellhead flange
摘要
Abstract
Objective To address the unclear mechanical behaviors of ultra-high-pressure(UHP)wellhead flanges under the coupled action of axial force,internal pressure and moment,a deformation-based moment calculation method is proposed,providing theoretical support for the design of non-standard flanges with a pressure rating of 175 MPa.Method By combining finite element simulations with composite loading tests,a flange deflection angle-moment calculation model was established.Strain gauges were employed to monitor the stress distribution of the flange during loading,and comparative analysis between simulation results and experimental data was conducted to verify the accuracy and applicability of the proposed model.Result The relative error of moment calculation for the proposed model did not exceed 15%.Under the C8 condition,the stress on the inner side of the flange midsection reached 471.69 MPa,which was 2.1 times that on the outer side but still below the material yield strength.Moreover,when the axial force increased to 18 000 kN,the elastic coefficient rose by 5.63 times.Conclusion The proposed method enables accurate quantification of flange moment under multi-load coupling,reveals the axial force-dominated variation rules of the elastic coefficient,and provides a new approach for the safe design of UHP flanges.关键词
特高压法兰/多载荷耦合/力矩计算方法/弹性系数演化/有限元-试验协同分析Key words
ultra-high-pressure flange/multi-load coupling/moment calculation method/evolution of the elasticity coefficient/finite element test synergistic analysis引用本文复制引用
胥志雄,冯少波,王春生,魏军会,李滨,武胜男,谢俊峰..多载荷耦合的特高压井口法兰力学响应特性分析[J].石油与天然气化工,2025,54(5):74-81,8.基金项目
中石油集团公司关键核心技术攻关项目"175 MPa特高压井口及配套装备安全评估技术研究"(201023063206) （201023063206）
