摘要
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 H2S/CO2 media with high salinity. The effect of small amount H2S on CO2 corrosion behavior of oil tube steel was discussed by the following technologies, such as SEM, XRD, dynamic potential scanning, AC impedance and electrochemical techniques, and the characteristics of corrosion conduct film and corrosion mechanism were studied. The results showed that the corrosion rate is the highest in pure CO2 corrosion, up to 2.4 mm/a. When the H2S/CO2 partial pressure ratio is 1/400, the corrosion rate decreases rapidly;with H2S/CO2 partial pressure ratio increases, the corrosion rate firstly increases then decreases, but are less than a single CO2 corrosion rate. H2S/CO2 partial pressure 1/400 is critical point of corrosion control. When H2S/CO2 partial pressure is more than 1/400, the corrosion process gradually transforms into H2S control.关键词
油管钢/高温高压/H2S与CO2分压比/腐蚀控制Key words
oil tube steel/high temperature and high pressure/H2S/CO2 partial pressure/corrosion control分类
矿业与冶金
