N80油管在井下使用过程中发生了早期腐蚀穿孔失效。对穿孔油管宏观形貌、材料化学成分、金相组织等进行了分析，并运用扫描电子显微镜（SEM）和能谱仪（EDS）观察和分析了油管横截面腐蚀形貌和腐蚀产物成分，结合井下的工况条件对N80油管的失效原因进行了分析。结果表明：N80油管腐蚀穿孔的主要原因是由腐蚀介质引起的电化学腐蚀，油管内输送介质中的氯离子对于腐蚀穿孔起到了重要作用。

Early perforation failure occurred in underground usage of N80 pipe. Reasons for the failure of the N80 pipe were analyzed through macro corrosion morphology, chemical composition of the pipe material and metallographic structure. And the corrosion morphology and composition of corrosion products on the cross section of the failed N80 pipe were investigated by scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDS). The results indicate that the main reasons for perforation failure of the N80 pipe was electrochemical corrosion, and Cl^- in the medium transported by the pipe played a major role in the corrosion process.