CO2 Corrosion Behavior of N80Q Steels under 90℃ Underground Environment of Certain Oil Field
In order to provide reference suggestions for selection of materials for the actual underground corrosion environment of a certain oil field,a high-pressure autoclave was used to simulate the CO2 corrosion behavior of N80Q steel pipes prepared by the 25Mn2,1CrRE and 2Cr steel under 90 ℃ and 1.0 m/s in the underground corrosive environment of the oil field.Additionally,scanning electron microscopy,energy dispersive spectroscopy and X-ray diffraction were utilized to characterize corrosion product films of three types of steel.Results showed that the three steels mainly exhibited uniform corrosion characteristics at 90 ℃,and the difference in average corrosion rates was not significant.Meanwhile,the corrosion product films consisted of a relatively dense double-layered structure,and their composition were main FeCO3 and a small amount of FeOOH.The research suggested that Fe3C as an anode in the corrosion film could generate FeCO3 and FeOOH,which led to a significant decrease in corrosion rate at 90 ℃.
CO2 corrosionlow-alloy steelanodic protection effect
万方数据
