目的 通过分析陕北延长油田某联合站集输系统管线的腐蚀行为，找出该区块集输系统的腐蚀原因，进而提出控制腐蚀的有效方法。方法 基于灰关联分析理论，分析了集输系统采出液腐蚀的主要影响因素及其对管线设备腐蚀的影响程度。应用EDX能谱仪和DXS-500全自动三维成像显微镜，对集输管线内腐蚀产物和Q235钢进行表征。采用正交试验方法，合成适用于该集输管线的缓蚀剂，通过极化曲线和缓蚀性能评价对缓蚀剂进行定性和定量分析。结果 管线腐蚀的主要影响因素为pH值、S^2?、SRB、CO2、Cl^?等，能谱分析得出腐蚀产物主要组成有Fe、O、C、S元素。采用投加50 mg/L氧化性高效脱硫杀菌剂和50 mg/L缓蚀剂的措施后，挂片表面光滑且呈红色和黄色，坑的数量大幅度减少，坑的深度大幅度减小，最大腐蚀深度由80.937 μm减少到16.25 μm，腐蚀速率降低到0.0324 mm/a，缓蚀率达到90%以上。结论 Cl^?破坏金属表面钝化膜、CO2和H2S协同作用共同影响着金属的腐蚀速率。采用氧化性高效脱硫杀菌剂配合所合成的缓蚀剂来控制腐蚀完全可行，可有效解决集输管线的腐蚀问题。

By analyzing the pipeline corrosion behavior of the gathering and transportation system in Yanchang oilfield in northern Shaanxi province, the corrosion reasons of the gathering and transportation system in this block were found out, and the effective methods for controlling the corrosion were put forward. Based on the grey correlation analysis theory, the main factors of corrosion of the produced liquid in gathering and transportation system and the influence degree of corrosion on pipeline equipment were analyzed. The internal corrosion products and Q235 steel in the gathering and transportation pipeline were characterized by EDX energy spectrometer and DXS-500 automatic three-dimensional imaging microscope. The corrosion inhibitors suitable for the gathering and transportation pipeline were synthesized by orthogonal test method. The corrosion inhibitors were qualitatively and quantitatively analyzed by polarization curve and corrosion inhibition performance evaluation. The results showed that the main factors of pipeline corrosion were pH value, the content of S2?, SRB, CO2, Cl? and so on. The energy spectrum analysis showed that the main components of the corrosion products were the elements of Fe, O, C, and S. The surface of the hanging sheet was smooth and appeared red and yellow, the number and depth of the pits significantly reduced, the maximum corrosion depth was decreased from 80.94 μm to 16.25 μm, the corrosion rate was reduced to 0.0324 mm/a, and the corrosion inhibition rate reached more than 90% after addition of 50 mg/L oxidizing high-efficiency desulfurization fungicide and 50 mg/L corrosion inhibitor. The results showed that Cl? destroy the passivation film on the metal surface and the synergy CO2 and H2S synergistic effect the corrosion rate of the metal. The combination of the oxidizing high-efficiency desulfurization fungicides and the new corrosion inhibitors could control corrosion and get better effects, which help to solve the corrosion problem of gathering pipelines.