Study of corrosion mechanism and prevention methods for gas well in condensate gas reservoir with rich CO₂

Corrosion in condensate gas well is very common, this paper describes multi-phase flowing corrosion phenomenon. Corrosion mechanism in gas well in condensate gas reservoir with rich CO₂ is analyzed, which is electronic dipole corrosion produced by micro cell formed on metal surface in acid environment. Moreover, affecting factors of corrosion for multi-phase flowing in condensate gas well are discussed such as temperature, partial pressure of CO₂, flowing rate, phase, flowing type, etc. And effective prevention technologies are presented, for example, stainless steel pipe, glass lined steel pipe, coated tubing, corrosion inhibitor injection, cathodic protection, pH value increasing and so on. Corrosion case of Huangqiao Gasfield rich in CO₂ condensate demonstrates the effectiveness of technologies to resist carrion in gas well in condensate gas reservoir with rich CO₂.