管网防腐层差异对管线阴保电位的影响研究  

Research on influence of different anticorrosive coatings on cathodic protection potential in pipeline network

作　　者：王芫芫 杨超[1] 韩玮 王安泉[1] 刘瑾[1] WANG Yuanyuan;YANG Chao;HAN Wei;WANG Anquan;LIU Jin(Technology Inspection Center of Shengli Oilfield,SINOPEC,Dongying 257000,China)

机构地区：[1]中国石化胜利油田分公司技术检测中心,山东东营257000

出　　处：《石油化工腐蚀与防护》2023年第5期1-4,共4页Corrosion & Protection In Petrochemical Industry

基　　金：中国石化胜利油田分公司重点科技项目“管道阴保电位不断电评价装置”(YQK2301⁃1)。

摘　　要：阴极保护是埋地金属管道防腐蚀的主要方式之一,但是管廊中多条管线之间的阴极保护存在相互干扰。目前管廊内管道的联合保护是解决这一问题的关键,但是联合保护管网中目标管线的阴保电位测试仍然受管网中其他管线的影响,导致测试结果不准确,通过数值模拟方法研究了管网防腐层差异对管线IR降的影响。结果表明,目标管线的IR降主要与管网总防腐层质量有关,呈对数关系,并且管网中管线数量越多,管线之间防腐层差异形成杂散电流导致的目标管线IR降越小。Cathodic protection is one of the main ways to prevent corrosion in buried metal pipelines.Due to the interference of cathodic protection between multiple pipelines in the pipeline corridor,joint protection is the key to solving this problem.Howev⁃er,cathodic protection potential test of the target pipeline in the joint protection is still affected by other pipelines in the network,resulting in inaccurate test results.Therefore,the influence of different coatings on pipeline IR drop is studied through numerical simulation methods.The results indicate that the IR drop of the target pipeline was mainly related to the quality of the total anti⁃corrosion layer of the pipeline network,in a logarithmic relationship.The more pipelines in the pipeline network,the smaller the IR drop of the target pipeline induced by stray current caused by the difference in anti⁃corrosion layers between pipelines.

关 键 词：管网 防腐层差异 阴极保护 IR降 

分 类 号：TE65[石油与天然气工程—油气加工工程] TQ050.9[化学工程]