对输油管线内、外腐蚀情况进行了调查和腐蚀因素的分析 :管线输送介质为脱水原油 ,长期运行形成管道底部污水沉积 ,污水介质偏酸性 ,含有大量硫酸盐还原菌 (SRB)、腐生菌 (TGB)和碳酸氢根、氯离子腐蚀促进剂 ,造成内腐蚀穿孔 ;管线外壁防护层一半以上老化破损 ,且土壤含盐量高 ,电阻率低 ,pH低 ,造成管道外腐蚀穿孔。建议对管内投加适当的化学药剂 ,管外补加阴极保护 The internal and external corrosion of the oil pipeline was investigated and the corrosion factors were analyzed. The pipeline transportation medium was dehydrated crude oil, long-term operation formed the sewage sediment at the bottom of the pipeline, the wastewater medium was acidic, and contained a large amount of SRB and saprophytic bacteria TGB), and bicarbonate and chloride ion corrosion promoters, resulting in internal corrosion perforation. More than half of the outer protective wall of the pipeline is aged and damaged, and the soil has high salt content, low resistivity and low pH, causing corrosion and perforation outside the pipeline. It is advisable to add appropriate chemicals to the tube and add cathodic protection outside the tube