电磁法在埋地管道磁记忆检测中的应用研究

doi:10.16265/j.cnki.issn1003-3033.2019.06.020

中国安全科学学报 ›› 2019, Vol. 29 ›› Issue (6): 122-127.doi: 10.16265/j.cnki.issn1003-3033.2019.06.020

电磁法在埋地管道磁记忆检测中的应用研究

李忠吉¹, 李长俊¹ 教授, 成婷婷¹, 何玉发²

1 西南石油大学石油与天然气工程学院,四川成都 610500;
2 中海油研究总院有限责任公司,北京 100010

收稿日期:2019-03-04 修回日期:2019-05-13 发布日期:2020-11-02
作者简介:李忠吉(1994—),男,四川成都人,硕士研究生,研究方向为油气储运安全技术等。E-mail:lizhongjiswpu@163.com。
基金资助:
国家重大科技专项子课题(2016ZX05028-001-006)。

Application of electromagnetic method in magnetic memory testing of buried pipelines

LI Zhongji¹, LI Changjun¹, CHENG Tingting¹, HE Yufa²

1 School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu Sichuan 610500, China;
2 China National Offshore Oil Corporation Research Institute Co. Ltd., Beijing 100010, China

Received:2019-03-04 Revised:2019-05-13 Published:2020-11-02

摘要/Abstract

摘要： 为提高埋地管道磁记忆检测的准确性,减少外界因素对磁记忆信号的干扰,基于强化磁记忆检测技术,研究电磁法对埋地管道磁记忆的影响。首先,通过管道磁化原理,分析管道磁化强度随外磁场的变化关系;然后,建立电磁法下管道磁感应强度梯度模量的计算模型,并分析电流大小对磁感应强度梯度模量的影响;最后,在某埋地管道磁记忆检测中应用电磁法,并与地磁场下的检测结果进行对比。结果表明:在地磁场下,管道磁化强度的增长率较大;应用电磁法能加强管道的磁化强度,增大缺陷处的磁感应强度梯度模量,起到凸显缺陷处磁记忆信号特征和抑制干扰因素影响的作用,从而提高埋地管道磁记忆检测的灵敏度。

关键词: 管道缺陷, 磁记忆检测, 磁化原理, 电磁法, 干扰因素

Abstract: In order to improve the accuracy of magnetic memory testing of buried pipelines and reduce the interference of external factors on magnetic memory signals, the effect of electromagnetic method on buried pipelines' magnetic memory is studied by using enhanced magnetic memory detection technology. Firstly, based on the analysis of the magnetization principle of pipelines, the change of magnetization intensity along with that of external magnetic fields was analyzed. Then, a computational model for the gradient modulus of magnetic induction intensity applied to buried pipelines by electromagnetic method was established, and the influence of current on gradient modulus of magnetic induction intensity was analyzed. Finally, the electromagnetic method was used in the magnetic memory testing of some buried pipelines, and its testing results were compared with the results under the geomagnetic field. The results show that the growth rate of pipelines' magnetization intensity is larger under the geomagnetic field, and the application of electromagnetic method can strengthen pipelines' magnetization and increase magnetic induction gradient modulus of the defect, which can highlight the characteristics of the magnetic memory signal at the defect and suppress the influence of interference factors, therefore improving the magnetic memory testing sensibility of buried pipelines.

Key words: pipeline defect, magnetic memory testing, magnetization principle, electromagnetic method, interference factor

中图分类号:

X924.2

李忠吉, 李长俊, 成婷婷, 何玉发. 电磁法在埋地管道磁记忆检测中的应用研究[J]. 中国安全科学学报, 2019, 29(6): 122-127.

LI Zhongji, LI Changjun, CHENG Tingting, HE Yufa. Application of electromagnetic method in magnetic memory testing of buried pipelines[J]. China Safety Science Journal, 2019, 29(6): 122-127.

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电磁法在埋地管道磁记忆检测中的应用研究

Application of electromagnetic method in magnetic memory testing of buried pipelines

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