摘要
针对并行管道之间阴极保护系统相互干扰问题,基于边界元法通过数值模拟技术建立了并行管道物理模型,并模拟了不同因素下干扰管道的阴极保护电位分布情况和电位偏移量,采用Sobol算法揭示了影响因素的全局敏感性和交互作用,最后针对主控因素形成了满足干扰防护要求的图版工具。结果表明,模拟电位分布与电位数据记录仪得到的测试电位分布情况基本一致,相对误差较小,满足工程需求;随着土壤电阻率、涂层破损率的增大,近阳极端的电位负移,远阳极端的电位正移,土壤电阻率超过50Ω·m时存在直流干扰;随着管道间距、辅助阳极位置的增大,近阳极端的电位正移,远阳极端的电位负移;土壤电阻率、防腐层破损率和管道间距之间存在较强的交互作用;图版工具可实现管道最小并行间距的快速符合性验证。
To address the problem brought by mutual interference of cathodic protection systems between parallel pipelines,a physical model of parallel pipelines is built by numerical simulation technology based on the boundary element method.The cathodic protection potential distribution and potential offset of interference pipelines under different factors are simulated.The Sobol algorithm is used to reveal the global sensitivity and interaction of influencing factors.Finally,according to the main control factors,a chart tool is formed to meet the requirements of interference protection.The results show that the simulated potential distribution is consistent with the measured potential distribution obtained by the potential data recorder,with a small relative error,meeting the engineering requirements.With the rise of soil resistivity and coating breakage rate,the near positive extreme potential will shift negatively,and the far one will shift positively.When the soil resistivity exceeds 50Ω·m,there will be DC interference.With the increase of pipe spacing and auxiliary anode position,the near positive extreme potential will shift positively,and far one will shift negatively.There is a strong interaction between soil resistivity,corrosion protection layer failure rate,and pipeline spacing.The chart tool enables the fast compliance verification of the minimum parallel spacing of pipelines.
作者
张亮
耿晓娟
杨丽红
何子龙
秦英
梁昌晶
ZHANG Liang;GENG Xiaojuan;YANG Lihong;HE Zilong;QIN Ying;LIANG Changjing(No.1 Oil Production Company of Huabei Oilfield Company,CNPC,Renqiu 062552,China;Huabei Oilfield Huagang Gas Group Co.Ltd.,Renqiu 062552,China;Bayan Exploration and Development Branch,CNPC North China Oilfield Company,Bayannur 015000,China)
出处
《石油工程建设》
2024年第6期68-73,共6页
Petroleum Engineering Construction
关键词
并行管道
阴极保护
干扰
边界元
图版工具
parallel pipeline
cathodic protection
interference
boundary element
chart tool
