双腐蚀缺陷海底管道临界失效压力  

Critical Failure Pressure of Submarine Pipeline with Double Corrosion Defect

作　　者：冯欣鑫 余杨[1,2] 徐立新[1,2] 王谦[3] 余建星[1,2] 冯丽梅 FENG Xinxin;YU Yang;XU Lixin;WANG Qian;YU Jianxing;FENG Limei(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai Jiao Tong University,Shanghai 200240,China;CNOOC Deepwater Development Co.,Ltd.,Shenzhen 518000,Guangdong,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300350 [2]上海交通大学高新船舶与深海开发装备协同创新中心,上海200240 [3]中海石油深海开发有限公司,广东深圳518000

出　　处：《中国海洋平台》2018年第5期87-94,共8页China offshore Platform

基　　金：国家工信部高技术船舶科研项目"500m水深油田生产装备TLP自主研发"(CCL2016SZGF0003);国家重点基础研究发展计划(973计划)(2014CB046804);国家自然科学基金(51239008)

摘　　要：为研究含双腐蚀缺陷管道的失效机理,采用非线性有限元分析方法,研究轴向间距、环向间距对含双腐蚀缺陷管道剩余强度的影响。结果表明:在腐蚀缺陷宽度和深度不变的条件下,双腐蚀缺陷轴向间距的变化对管道临界失效压力有较强影响;环向双腐蚀缺陷管道的临界失效压力与腐蚀缺陷的环向夹角没有显著关系。基于此建立了含双腐蚀缺陷管道临界失效压力与含单腐蚀缺陷管道临界失效压力之间的关系,并根据规范中含单腐蚀缺陷管道临界失效压力的计算公式,推导出含双腐蚀缺陷管道的临界失效压力,其可通过计算对应长度及2倍长度单腐蚀管道的失效应力乘以无量纲函数求得,简化了含双腐蚀缺陷管道的临界失效压力的计算方法,并通过算例验证了本文方法的正确性和通用性,并得出对工程有益的结论。In order to study the failure mechanism of the pipeline with double corrosion defects, the nonlinear finite element method is used to analyze the influence of axial distance and circumferential spacing on the residual strength of the double corrosion defect pipeline. The results show that the change of the axial distance between the two corrosion defects has a large influence on the failure of the pipeline under the condition of constant distance between the circumferential double corrosion defects and constant depth of the corrosion defects. There is no significant relationship between the critical failure pressure and the circumferential angle of the two corrosion defects. The relationship between the single corrosion defect of pineline failure and the double corrosion defects of pipeline failure is built. The critical failure pressure of the pipeline with double corrosion is deduced by calculating the failure stress of the single corrosion pipe with the corresponding length and double length, multiplied by a dimensionless function, which simplifies the calculation of critical failure pressure of double corrosion defects pipeline. The correctness and versatility of the result are proved by examples, which is helpful in the real submarine engineering.

关 键 词：海底管道 腐蚀缺陷 临界失效压力 有限元分析 

分 类 号：TE973[石油与天然气工程—石油机械设备]