目的 研究三种油田常用材质 N80、 45#、 20#钢在华北油田京 11 断块注入水中的腐蚀行为。方法 采用离子色谱法对京 11 断块注入水进行水质分析，采用失重法和电化学极化曲线测试方法研究了 N80、 45#、 20#钢管材在华北油田京 11 断块注入水中的腐蚀规律与腐蚀机理，并对试样腐蚀前后的形貌进行了记录分析。 结果 当注入水中的碳酸钠质量浓度为 1000 mg/L 和 4000 mg/L 时， 45#、 20#和 N80 三种试样的腐蚀速率较大， 45#钢的腐蚀速率最大，为 0.1322 mm/a，且试样表面均产生了明显的腐蚀坑及大量腐蚀产物；当碳酸钠质量浓度为 12 000 mg/L 和 20 000 mg/L 时， 3 种试样的腐蚀速率很小，远远低于 0.076 mm/a，且试样表面几乎不产生腐蚀产物。 结论 当京 11 断块注入水中的碳酸钠投加量低于 12 000 mg/L 时，管柱的腐蚀较严重；当碳酸钠投加量高于 12 000 mg/L 时，管柱的腐蚀较为轻微，并且在相同的腐蚀环境下， N80 钢比 20#、 45#钢具有更好的耐蚀性能。

The work aims to study corrosion behavior of three common oilfield materials-N80, 45# and 20# steels in injected water of Jing 11 fault block of Huabei Oilfield. The ion content of injecting water was analyzed by ion chromatography. Corrosion law and mechanism of the three ordinary materials of steel pipe injected to water of Jing 11 fault block of Huabei Oilfield were studied by virtue of weight-loss method and electrochemical polarization curve tests. Moreover, morphology of the specimens before and after corrosion was recorded and analyzed. When the mass concentration of sodium carbonate injected to water was 1000 mg/L or 4000 mg/L, 45#, 20# and N80 demonstrated higher corrosion rate, and 45# specimen demonstrated maximum corrosion rate of 0.1322 mm/a. In addition, many obvious corrosion pits and a plenty of corrosion products were present on the surface of specimens. When the concentration of sodium carbonate was 12 000 mg/L or 20 000 mg/L, the corrosion rates of three specimens were very low and much lower than 0.076 mm/a, little corrosion product was produced on the surface of specimens. The corrosion is very serious when the additive amount of sodium carbonate injected to water is lower than 12 000 mg/L. The corrosion of pipe column is very slight and N80 steel demonstrates better corrosion resistance than 45# and 20# in the same corrosion environment when the additive amount of sodium carbonate is higher than 12 000 mg/L.