Under simulated corrosion environment of CO2 production wells in oilfields,high-temperature and high-pressure corrosion experiments were carried out on P110 steel casing steel for oil wells.The corrosion rate was measured by weight loss method.The surface morphology and chemical composition of the corrosion products were observed by SEM,EDS and XRD.The results showed that the corrosion rate of P110 steel increased with the rise of temperature and CO2 partial pressure in the gas phase environment.While in the liquid phase environment,the corrosion rate of P110 steel reached the maximum at 80 ℃,which was 3.7182 mm·a-1,and then decreased with the temperature higher than 90 ℃.When the partial pressure of CO2 was less than 1 MPa,the corrosion rate of P110 steel increased rapidly with the rise of the partial pressure.In contrast,it increased slowly when the partial pressure of CO2 was higher than 1 MPa.The main components of corrosion products were FeCO3 and a small amount of rust.At high temperatures,the corrosion product film had a certain protective effect on the metal.
万方数据