摘要
油田埋地金属管道周围存在着大量的高压输电线路,这些设施在运行过程中会向大地释放大量的杂散电流,造成油气管道的腐蚀泄露。本文进行了高压输电线路周围埋地金属管道杂散电流的现场测试,结果表明:长输石油管道受杂散电流影响严重。尤其当高压输电线路与埋地输油管道近距离平行时,埋地输油管道中杂散电流更严重;油气集输管道受杂散电流影响也十分严重,管地电位波动值和管地电位最大正向偏移值都随着与高压输电线路距离的增加而减小;经排流保护措施后,管道的管地电位波动值和最大正向偏移值都明显减小,管道受杂散电流影响明显减弱,并达到了排流保护的标准。
There were amounts of high-voltage lines around buried pipelines. Much stray currents were released to the ground during these facilities operation process, and caused the leakage of pipeline in oil field. The in-situ test of stray current around buffed pipeline was performed. The results showed that the stray current had serious influence to long-distance pipeline. Especially, the effect was more serious when the pipelines were paralleled or cross to the high-voltage lines. The oil-gas gathering and transferring pipeline was also seriously affected. The fluctuation value and the maximum offset of pipeline-earth potential decreased with the distance to the high-voltage lines increasing. After the discharge protection, the fluctuation value and the maximum offset and the effect of stray current to pipeline obviously decreased, and the discharge protection came up to the standard.
出处
《全面腐蚀控制》
2010年第7期48-52,47,共6页
Total Corrosion Control
关键词
高压输电线路
杂散电流
排流保护
high-voltage line
stray current
discharge protection
