Corrosion Behavior of P110 Steel in Simulated CO₂ and Formation Water Environment

The corrosion behavior and mechanism of P110 steel tubing in in low CO 2 particle pressure and high salinity formation water environment was investigated through high temperature and high pressure dynamic immersion tests, macro-morphology analysis, scanning electron microscopy(SEM) inspection, energy disperse spectroscopy(EDS) analysis and X-ray diffraction(XRD) analysis. The Results showed that the increasing of CO 2 partial pressure accelerated the corrosion process of P110 tubing steel, and the corrosion rates of P110 tubing decreased with the increasing of temperature. Furthermore, the high content of Ca 2+ in the formation water also had a big influence on the corrosion behavior of P110 tubing steel, for it could affect the precipitation quantity and morphology of CaCO 3 at different temperature and CO 2 particle pressure.