能源公共走廊内管道交流干扰腐蚀判断准则  

Criterion for pipeline AC interference corrosion in the public energy corridor

作　　者：郝宏娜[1] 李自力[1] 衣华磊 王太源[1] 尚兴彬[1] 谢跃辉[1] 

机构地区：[1]中国石油大学(华东)油气储运工程系,山东青岛266555 [2]中海油研究总院,北京100027

出　　处：《油气储运》2012年第4期283-288,328,共6页Oil & Gas Storage and Transportation

基　　金：国家自然科学基金"新型滚珠旋转结构引发水力脉冲的过程及机理研究";50804053;国家科技重大专项"大型油气田及煤层气开发";2008ZX05017-04-01

摘　　要：高压输电线和交流电气化铁路的建设加快了公共能源走廊的形成,其与埋地油气管道交叉、并行或者靠近引发交流干扰腐蚀问题,威胁管道生产安全,世界各国相继颁布了交流干扰腐蚀判断准则和相关标准。对于无阴极保护的管道系统,多采用交流感应电压、交流电流密度进行判断;对于有阴极保护的管道系统,多采用交流电流和直流电流密度之比进行判断。对于新建管道系统,避免公共能源走廊内交流干扰腐蚀最直接的方法是消除高压输电线、电气化铁路等埋地管道的交流干扰源;对于在役管道系统,通过屏蔽网或者排流措施等减缓交流干扰腐蚀。对于交流腐蚀如何对阴极保护系统产生影响以及利用交流电压或交流电流密度评价交流腐蚀速率仍存在诸多认知空白有待填补。同时,需要因地制宜,研究制定适合我国国情的高压输电线、电气化铁路与油气管道的安全距离标准。Construction of high-voltage power lines and AC electrified railways speed up the formation of utility energy corridor.This causes AC interference corrosion problems due to being crossed with,parallel to,or near buried oil and gas pipelines,which may threaten the safe operation of pipeline.Criterions and relevant standards for AC interference corrosion are promulgated in countries worldwide.For pipeline systems without cathodic protection(CP),AC induction voltage and AC current density are more likely to be used.For pipeline systems with CP,the density ratio between AC current and DC current is more likely to be used.For new pipeline systems,the most direct method for avoiding AC interference corrosion in the public energy corridor is to remove AC interference sources from high-voltage power lines,electrified railways and other buried pipelines.For in-service pipeline systems,the AC interference corrosion is reduced by shielding or draining measures,or other measures.There are still many cognitive gaps to be filled on the effects of AC corrosion on CP systems and the use of AC voltage or AC current density for evaluation of AC corrosion rates.Meanwhile,standards for safe distance between high-voltage power lines,electrified railways,and oil & gas pipelines should be researched and developed based on the local conditions in order to meet the requirements in China.

关 键 词：能源公共走廊 油气管道 交流干扰 腐蚀 准则 

分 类 号：TE988[石油与天然气工程—石油机械设备]