某双管同沟敷设管线阴极保护系统干扰防护数值模拟研究  

Study on Numerical Simulation of the Interference Protection of Cathodic Protection System for Double-Pipe Pipelines Laid in the Same Trench

作　　者：陈帅 李洪福 罗小武 肖会会 时彦杰 罗泰星 刘艳明 王晨 吕祥鸿[1] 崔光磊 CHEN Shuai;LI Hongfu;LUO Xiaowu;XIAO Huihui;SHI Yanjie;LUO Taixing;LIU Yanming;WANG Chen;LYU Xianghong;CUI Guanglei(School of Material Science and Engineering,Xi’an Shiyou University,Xi’an 710065,China;Oil-Gas Storage and Transportation Company,PetroChina Xinjiang Oilfield Company,Karamay 834000,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;Key Laboratory of Liaoning Province on Deep Engineering and Intelligent Technology,Northeastern University,Shenyang 110819,China)

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065 [2]中国石油新疆油田油气储运分公司,新疆克拉玛依834000 [3]东北大学资源与土木工程学院,辽宁沈阳110819 [4]东北大学辽宁省深部工程与智能技术重点实验室,辽宁沈阳110819

出　　处：《材料保护》2024年第6期175-185,198,共12页Materials Protection

摘　　要：为明确同沟敷设管道阴极保护系统相互干扰规律及干扰防护措施,以新疆油田某双管同沟敷设管道(D219和D457)为模型,设置D219管道的涂层破损率为0.1%,D457管道的涂层破损率为0.1%、0.5%、1.0%,采用数值模拟方法对不同阴极保护设计及阴极保护干扰防护措施的有效性及适用性进行评估。结果表明:采用浅埋阳极单独阴极保护的同沟敷设管道存在阴极保护系统相互干扰,随着干扰管道D457防腐层破损率的增加,其对并行管道D219的干扰程度增强,施加均压线措施可有效降低干扰;采用浅埋阳极联合阴极保护+均压线措施可消除同沟敷设管道阴极保护系统的相互干扰,当双管同沟管道防腐层破损率相差较大(D2190.1%,D4571.0%)时,改善效果较为显著;对于采用深井阳极联合阴极保护的同沟敷设管道,当D457防腐层破损率较大(1.0%)、土壤电阻率较高(50Ω·m)时,其阴极保护效果较差,采用均压线+牺牲阳极措施对阴极保护效果的改善作用不明显,而增大深井阳极输出电流联合均压线措施可显著改善同沟敷设管道的阴极保护效果。In order to clarify the mutual interference law and interference protection measures of the cathodic protection system of double-pipe pipelines laid in the same trench,a double-pipe same trench laying pipelines(D219 and D457)in Xinjiang oilfield was taken as a model,the coating breakage rate of D219 pipeline was set to 0.1%,and the coating breakage rates of D457 pipelines were set to 0.1%,0.5%,1.0%.Numerical simulation methods were used to evaluate the effectiveness and applicability of different cathodic protection designs and cathodic protection interference protection measures.Results showed that mutual interference of cathodic protection systems existed in the pipeline laying in the same trench with shallow buried anode separate cathodic protection.The interference degree of parallel D219 pipelines was enhanced as the breakage rate of the D457 anti-corrosion layer of the interfering pipeline increased,and equalizing line measures could be applied to reduce the interference effectively.The joint cathodic protection measures with shallow buried anode and equalizing line could eliminate the mutual interference of cathodic protection systems for the same trench laying pipelines.The improvement of cathodic protection effect was more significant when the difference in the breakage rate of the anti-corrosion layer of the same trench double-pipe pipelines was large(0.1%of D219 and 1.0%of D457).For the same trench pipelines under joint cathodic protection measures with deep well anode,the cathodic protection effect was poor when the breakage rate of the D457 anti-corrosion layer was large(1.0%)and the soil resistivity was high(50Ω·m).The improvement of cathodic protection effect was not significant by equalizing line and sacrificial anode measures.Increasing the output current of the deep well anode combined with equalizing line measures could significantly improve the cathodic protection effect of pipelines laid in the same trench.

关 键 词：双管线 平行敷设 直流干扰 阴极保护 排流保护 数值模拟 

分 类 号：TE832[石油与天然气工程—油气储运工程]