Title: Research on Second Corrosion Behavior of Oil Tube Steel in High Temperature and High Pressure Environments Containing H_2S/CO_2
Abstract: H2S/CO2 corrosion environments in oil and gas field containing rich S were simulated in a high temperature and high pressure autoclave manufactured by USA Cortest Company,and tests were conducted in flowing medium with high salinity. Second corrosion behavior of oil tube steel in high temperature and high pressure H2S/CO2 corrosion environments was analyzed and discussed by the following technologies,such as SEM,XRD,dynamic potential scanning,AC impedance and electrochemical techniques. The results showed that corrosion rate of N80 oil tube steel was very high,up to 1.89 mm/a.when solution immersion environment contain only CO2. If H2 S corrosion was conducted after CO2 corrosion, the corrosion rate reduced to 1.38 mm/a. The corrosion type showed distinct characteristic of local corrosion. Fe CO3 corrosion film formed firstly would be transformed to Fe S film,in this process,aberration of crystal lattice happened,which would result in delamination and loosen of film. If CO2 corrosion was conducted after H2 S corrosion, the corrosion rate decreased a lot,up to 0.27 mm/a,Fe S film formed firstly would not transformed. Through electrochemical test and analysis,the corrosion product film Fe S has a good protect to substrate,while Fe CO3 film is poor.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
Access and Citation
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot