Research Progress on Corrosion Behavior of Oil and Gas Pipelines in Wet CO2 and H2S Environments

Corrosion of pipes is a common problem in oilfield extraction, gathering, storage and transportation. Fluid containing CO2 and H2S will cause serious corrosion perforation and fracture of oil and gas field pipes, which will lead to fluid leakage. It not only pollutes the surrounding environment, but also causes safety accidents. In this paper, the corrosion behavior of common pipes in the field of oil and gas field exploitation is reviewed in the presence of wet CO2 and H2S alone and in the coexistence environment, and the influencing factors are analyzed. The results show that CO2 partial pressure and H2S partial pressure play a major role in the corrosion rate of the pipe in the presence of wet phase CO2 and H2S alone. In addition, the effect of Cl- concentration on the pipe cannot be ignored, and the corrosion rate of the pipe decreases at high Cl- concentration (>5 000 mg/L). Finally, the research on the corrosion of pipes in CO2/H2S system is prospected, in order to provide reference for the formulation of protection measures for oil and gas fields and the development of new corrosion-resistant pipes.