油气管道漏磁检测中提离值影响的三维仿真计算  

3D simulation on the influences of the lift-off value in MFL of oil/gas pipeline

作　　者：曹学文[1] 王英国 文闯[1] 曹朋朋[1] 

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,山东青岛266555 [2]中国石油北京油气调控中心,北京100007

出　　处：《油气储运》2012年第3期206-210,247,共5页Oil & Gas Storage and Transportation

基　　金：国家科技重大专项资助项目"积液监测方法优化及装置研发";2008ZX05017-004

摘　　要：运用有限元软件ANSYS对油气输送管道内腐蚀缺陷的漏磁信号进行三维有限元模拟,分析了不同形状缺陷的漏磁信号分布规律,研究了不同形状、尺寸缺陷模型传感器提离值与漏磁信号之间的关系。结果表明:缺陷漏磁场分布不仅与缺陷的严重程度(缺陷深度)有关,而且与缺陷的三维形状有较大关系,不同形状缺陷适合设定的提离值不同;提离值减小到某一值后,提离值越小,探头检测到的缺陷漏磁信号量越大,由提离值波动导致的误差相应减小。3D FEM simulation on the magnetic flux leakage(MFL) signals of internal defects in oil/gas pipeline is made with ANSYS,the distribution law of MFL signals accompanied with different shape defects is analyzed and the relationship between MFL signals and the model sensor's lift-off value with different shape and size defects.Results show that the distribution of MFL of defect is not only related to the seriousness of the defects,but also to their 3D shapes.The defects with different shapes have different optimum lift-off values.After the lift-off value is reduced to a certain value,the smaller the lift-off value is,the bigger the signals detected is,and the errors induced by the fluctuation of liftoff value will be accordingly reduced.

关 键 词：油气管道 ANSYS 漏磁信号 三维缺陷 提离值 

分 类 号：TE274[石油与天然气工程—油气井工程]