油气输送站场内外阴极保护系统间干扰数值模拟  

Numerical simulation of interference between cathodic protection systems inside and outside oil/gas stations

作　　者：董亮[1] 杜艳霞[1] 路民旭[1] 姜子涛[1] 贺哲丰[1] 陈鹏羽[2] 

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]中国石油大学石油工程学院,北京102249

出　　处：《石油学报》2013年第2期393-400,共8页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.51101015);中央高校基本科研业务费专项资金项目(FRF-TP-12-145A)资助

摘　　要：为了研究油气输送站场内、外阴极保护系统间的干扰问题,通过分析系统间干扰与单一阴极保护系统在数学模型和数值处理方法上的差异,采用数值模拟技术对站场内、外阴极保护系统间的干扰进行了研究,并利用室内模拟实验对干扰数学模型和计算方法进行了验证,同时根据实际案例计算分析了系统干扰程度的影响因素和影响规律。数值模拟结果表明:站内阴、阳极电场的叠加电场强度决定了站外管线所受的干扰程度及规律;由于站内阴极保护系统阳极地床类型及设置位置不同,叠加电场的强弱也不同,干扰程度的差异较大;随着站内阴极保护系统输出电流和土壤电阻率增大,叠加电场强度增加,干扰程度增大;站外管道干线的电位控制点应设置在距干扰侧一定距离之外,以避免站外阴极保护系统输出电流产生较大波动。An interference problem could be induced due to the difference between two cathcdic prctection（CP） systems currently applied inside and outside oil/gas stations This interference problem was studied with numerical simulation technology by analyzing differences of interference between systems and of a single CP system in processing approaches by mathematical models and numerical simulation methods.Both the mathematical model and the numerical simulation method dealing with interference problems were validated experimentally and then used to analysis influential factors of system interference degrees in the case calculation.The results showed that the degree of interference to pipelines outside an oil/gas station is determined by the electric field intensity superimposed by cathode and anode electric fields inside an oil/gas station.Therefore,different interference degrees are dependent on different types and locations of anode beds in the CP system inside the oil/gas station,and the interference degree increases with increasing the output current of the CP system and soil resistivity inside the oil/gas station,thus,the stronger the intensity of a superimposed electric field,the more the interference degree increases.In addition,the potential control point should be set in a reasonable distance from a station in order to avoid producing larger fluctuation by the output current of the outside CP system.

关 键 词：油气站场 阴极保护 干扰 数值模拟 影响因素 

分 类 号：TE988[石油与天然气工程—石油机械设备]