我国中西部的油田，大多面临严重的CO2腐蚀危害。为更清楚了解油管套管常用的N80钢在现场条件下腐蚀形貌、腐蚀速率等腐蚀行为，为油田选材提供依据，进行了模拟现场环境的腐蚀试验研究。研究结果表明，在温度为92℃、介质流速为12m/s、CO2分压为29648kPa、总矿化度为346g/L的水介质中，N80钢的平均腐蚀速率为08224mm/a，按NACE RP—0775—91标准属于极严重腐蚀；腐蚀试样表面除了存在大面积凹陷外，还有较深的腐蚀坑；金属表面腐蚀产物分为三层，各层形态和成分不同，但都不很致密；腐蚀产物主要是碳酸的复盐和Fe3C。 Most oilfields in central and western China are facing serious CO2 corrosion damage. In order to understand the corrosion behavior and corrosion rate of N80 steel commonly used in tubing casing under field conditions, the corrosion test of simulated on-site environment was provided for the selection of oil field. The results show that the average corrosion rate of N80 steel is 0 at a temperature of 92 ℃, a medium flow rate of 12m / s, a partial pressure of CO2 of 29648kPa and a total salinity of 346g / L 8224mm / a, according to the NACE RP-0775-91 standard belongs to very serious corrosion; corrosion sample surface in addition to the presence of a large area of ​​depression, there are deep corrosion pits; metal surface corrosion products are divided into three layers, the shape and Different composition, but not very dense; corrosion products are mainly carbonate double salt and Fe3C.