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B_(x)和B_(z)出现极值特征且方向相反,B_(y)出现过零点特征且峰值改变方向;离地高度与B_(x)和B_(z)的极值及B_(y)的峰值成反比;腐蚀缺陷尺寸与B_(x)和B_(z)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。
Aiming at the problem of corrosion detection of buried gathering and transportation pipeline under trenchless conditions,a self⁃leakage 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,B x and B z presented extreme value characteristics and the direction was opposite,B y 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 B x and B z and the peak values of B y;the size of corrosion defect was proportional to the extreme values of B x and B z and the peak value of B y.According to the oilfield field testing data,14 excavation points were selected to verify the distribution characteristics of mag⁃netic 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.
作者
刘贵江
林新洲
王鲜
徐超
吴冰
刘艳军
LIU Gui-jiang;LIN Xin-zhou;WANG Xian;XU Chao;WU Bing;LIU Yan-jun(National Network of Western Pipeline Tarim Oil and Gas Branch,Chengdu 610500,China;School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China)
出处
《材料保护》
CAS
CSCD
2023年第3期174-180,共7页
Materials Protection
关键词
埋地集输管道
非开挖检测
腐蚀缺陷
自漏磁场
磁感应强度
buried gathering and transportation pipeline
trenchless detection
corrosion defects
self⁃leakage magnetic field
magnetic induc⁃tion intensity
作者简介
通信作者: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。
