近年来,国内油田发生多起13Cr油管腐蚀失效事故,腐蚀部位主要集中在油管接头,腐蚀基本特征均为点蚀.某油井于2004年4月下入一批特殊扣13Cr油管,2010年6月对该井进行修井作业时,取出油管后发现大量油管的外螺纹接头台肩内壁及倒角消失部位存在明显腐蚀坑,油管下井深度为5001.85 m.本文以该井为例,通过理化检验及微观分析等手段对13Cr In recent years, many domestic oilfield 13Cr tubing corrosion failure occurred, the corrosion is mainly concentrated in the pipe joints, the basic characteristics of corrosion pitting. A well in April 2004 into a group of special buckle 13Cr tubing, June 2010 When the well was drilled, it was found that there were obvious corrosion pits in the inner wall of the shoulder of chamfer of a large number of oil pipes and the disappearance of chamfering, and the downhole depth of tubing was 5001.85 m.Taking the well as an example, Micro-analysis and other means of 13Cr