采油井配电箱漏电导致管道腐蚀泄漏案例

1. 中国石油管道科技研究中心·油气管道输送安全国家工程实验室;2. 中油管道检测技术有限责任公司; 3. 中石油长庆油田第十一采油厂

管道;杂散电流;快速腐蚀;腐蚀分析

A case study on the corrosion leakage of pipeline caused by the current leakage of switch box of oil production well
XU Huatian1, LI Bin2, SUN Yuxin3, ZHANG Feng1, CHEN Hongyuan1

1. PetroChina Pipeline R & D Center//National Engineering Laboratory for Pipeline Safety; 2. China Petroleum Pipeline Inspection Technologies Co. Ltd.; 3. No.11 Oil Production Plant, PetroChina Changqing Oilfield Company

pipeline, stray current, rapid corrosion, corrosion analysis

DOI: 10.6047/j.issn.1000-8241.2019.12.008

备注

针对某油田采油外输管道频繁腐蚀泄漏,且腐蚀速率远远超出正常范围的问题,通过对管道材质、土壤腐蚀性及杂散电流干扰的调查分析,最终确定管道快速腐蚀泄漏是由于直流杂散电流干扰导致的。在对形成干扰的配电箱进行整改后,消除了杂散电流干扰导致管道外腐蚀的现象。通过案例分析表明:当管道发生快速腐蚀泄漏时,应首先排查是否存在杂散电流干扰;当发现电气设备零线带电时,应测试管道对地电位,评价管道是否受到杂散电流干扰,及时消除隐患。(图8表2,参[20]

Several transportation pipelines of oil production wells in a certain oilfield suffer from corrosion leakagefrequently, whose duration and frequency greatly exceed the normal corrosion rate. In this paper, pipeline material, soilcorrosiveness and stray current interference were analyzed. It is determined that the DC stray current caused by the currentleakage of switch box of oil production well is the main reason for the rapid corrosion of the pipeline. After rectification,the phenomenon of external corrosion of the pipeline caused by stray current interference is eliminated. And it is furtherascertained that when the neutral line of power line is charged, pipeline-to-soil potential test shall be carried out to evaluatethe existence of stray current interference, so as to eliminate the hidden troubles in time. (8 Figures, 2 Tables, 20 References)

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