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基于磁偶极子模型的集输管道腐蚀非开挖检测

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  • 1.国家管网西部管道塔里木输油气分公司,新疆 库尔勒 841000; 2.西南石油大学机电工程学院,四川 成都 610500
刘艳军(1979-),博士,研究生,研究方向为管道无损检测,电话:13693498308,E-mail:SWPUliuyanjun@126.com

收稿日期: 2022-09-17

  修回日期: 2022-10-12

  录用日期: 2022-11-06

  网络出版日期: 2023-03-15

Trenchless Detection of Gathering and Transportation Pipeline Corrosion Based on Magnetic Dipole Model

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  • 1.National Network of Western Pipeline Tarim Oil and Gas Branch,Chengdu 610500,China; 2.School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China

Received date: 2022-09-17

  Revised date: 2022-10-12

  Accepted date: 2022-11-06

  Online published: 2023-03-15

摘要

针对埋地集输管道在非开挖条件下的腐蚀检测难题,根据磁偶极子模型,考虑腐蚀缺陷磁荷分布,建立一种埋地集输管道腐蚀缺陷自漏磁场模型。通过数值模拟方法研究了腐蚀缺陷磁感应强度波形特征及不同离地高度、腐蚀缺陷尺寸对磁感应强度的影响。结果表明:腐蚀缺陷处Bx 和Bz 出现极值特征且方向相反,By 出现过零点特征且峰值改变方向;离地高度与Bx 和Bz 的极值及By 的峰值成反比;腐蚀缺陷尺寸与Bx 和Bz 的极值及By 的峰值成正比。根据油田现场检测数据,选取14 处开挖点验证了腐蚀缺陷磁感应强度分布特征,选取3 处开挖点验证了离地高度及腐蚀缺陷尺寸与磁感应强度间的关系。

本文引用格式

刘贵江, 林新洲, 王鲜, 徐超, 吴冰, 刘艳军 . 基于磁偶极子模型的集输管道腐蚀非开挖检测[J]. 材料保护, 2023 , 56(3) : 174 -180 . DOI: 10.16577/j.issn.1001-1560.2023.0074

Abstract

Aiming at the problem of corrosion detection of buried gathering and transportation pipeline under trenchless conditions,a selfleakage magnetic field model for corrosion defects of buried gathering and transportation pipeline was established based on the magnetic dipole model and considering the magnetic charge distribution of corrosion defects.The waveform characteristics of magnetic induction intensity of corrosion defects and the effects of different height off the ground and size of corrosion defects on the magnetic induction intensity were studied by numerical simulation.Results showed that at the corrosion defect,Bx and Bz presented extreme value characteristics and the direction was opposite,By had the feature of passing zero and the peak value changed the direction;the height off the ground was inversely proportional to the extreme values of Bx and Bz and the peak values of By;the size of corrosion defect was proportional to the extreme values of Bx and Bz and the peak value of By.According to the oilfield field testing data,14 excavation points were selected to verify the distribution characteristics of magnetic induction intensity of corrosion defects,and 3 excavation points were selected to verify the relationship between the height off ground and the size of corrosion defects and magnetic induction intensity.

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