基于动态磁多极子场的管道内外壁缺陷区分方法  

Distinction method of pipeline inner and outer defects based on the dynamic magnetic multipole field

作　　者：呼婧 刘思娇 郑莉[1] 许振丰[1] 唐建华 HU Jing;LIU Sijiao;ZHENG Li;XU Zhenfeng;TANG Jianhua(Beijing Huahang Radio Measurement Institute;CNOOC Energy Development Equipment Technology Co.Ltd.)

机构地区：[1]北京华航无线电测量研究所 [2]中海油能源发展装备技术有限公司

出　　处：《油气储运》2021年第6期673-678,共6页Oil & Gas Storage and Transportation

基　　金：国家重点研发计划“深海油气管道内外检测与故障诊断装备开发与示范应用”,2017YFF0108800;国家自然科学基金资助项目“基于动态似稳磁场模型的内外壁缺陷漏磁信号特征分析与提取”,61401415。

摘　　要：为了对动态条件下管道漏磁内检测中的内外壁缺陷信号进行识别,针对动态条件下管壁产生的感生涡流磁场,建立了基于磁多极子场的动态漏磁场数学模型。从漏磁内检测器获取的缺陷信号中提取出内外缺陷区分的数据特征,确定了基于磁多极子场的管道内外壁缺陷区分方法:当缺陷的上升沿或下降沿至少其一满足第2阶磁场参数绝对值最大时判定为内缺陷,当上升、下降沿均不满足第2阶磁场参数绝对值最大时判定为外缺陷。通过内外缺陷试验数据的识别概率,对该方法进行了验证。新建立的区分方法辨识准确率高,突破了检测器需要借助硬件传感器的条件限制,对漏磁缺陷的识别、原理分析及内外区分具有指导作用。In order to identify the inner and outer defect signals in pipeline magnetic flux leakage(MFL)internal inspection under dynamic conditions,a mathematical model of dynamic leakage magnetic field based on the magnetic multipole field was established for the induced eddy current magnetic field generated in the pipe wall under dynamic conditions.With the data characteristics of the inner and outer defects of pipeline extracted from the measured defect signals obtained by the inline MFL detector,the method for distinguishing the inner and outer defects of the pipeline based on the magnetic multipole field was determined:that is,the defect can be judged as an inner defect if the rising edge or the falling edge of the defect,or both,have the maximum absolute value of the second-order magnetic field parameter,or as an outer defect if both of the rising edge and the falling edge do not have the maximum absolute value of the second-order magnetic field parameter.Additionally,the method was verified by the identification probability of the measured data of the inner and outer defects.The results show that,the new distinction method has a high recognition accuracy rate,which breaks through the conditional restrictions of detector’s relying on hardware sensors.It is of guiding significance to the identification of MFL defects,principle analysis and distinction of inner and outer defects.

关 键 词：管道 漏磁内检测 动态磁化 磁多极子场 内外壁缺陷区分 

分 类 号：TN98[电子电信—信息与通信工程] TE88[石油与天然气工程—油气储运工程]