选取某腐蚀穿孔L320输油管道静置段作为研究对象，通过现场调研、理化检验和电化学方法等方法，研究了原油输送管道静置段的腐蚀原因。结果表明，原油输送管道静置段的服役环境主要为含H₂S、CO₂、矿化物的油水混合介质，腐蚀失效主要集中在管道内壁的5~7点钟部位，腐蚀产物呈疏松状，含有S、O、C、Fe元素，失效的主导因素为含H₂S与CO₂的原油沉积水引起的局部腐蚀。此外，疏松状的腐蚀产物有加速腐蚀的作用，腐蚀形态也由局部腐蚀转变为均匀腐蚀。

The static section of a corrosion perforated L320 oil pipeline was selected as the research object. The corrosion causes of the stationary section of the crude oil pipeline were studied through field investigation, physical and chemical testing and electrochemical methods. The results show that the service environment of the stationary section of the crude oil pipeline was mainly oil-water mixed medium containing H₂S, CO₂ and mineral compounds. Corrosion failure was mainly concentrated on the 5 to 7 o'clock position on the inner wall of the pipeline. The corrosion product was loose and contained S, O, C, and Fe elements. The dominant factor of failure was localized corrosion caused by crude oil deposited water containing H₂S and CO₂. In addition, the loose corrosion products had the effect of accelerating corrosion, and the corrosion morphology was also changed from localized corrosion to uniform corrosion.