Abstract: The internal corrosion of well tubing in oilfield production is always serious and the accidents of tubing perforation and rupture occur frequently，which directly affects the normal production and performance monitoring.In order to find out the cause of well corrosion，based on extensive literature review on CO2 corrosion，external environmental factors which influence corrosive rate such as environmental temperature，CO2 partial pressure，pH value and flow rate are analyzed.Integrating lab experiment and field application，a new corrosion prediction model developed upon NORSOK model is established which is more applicable considering field reality.This model broadens the application extent of NORSOK corrosion model and the sensitivity analysis is undertaken on the factors affecting corrosion rate.The result of this analysis coincides with that of the laboratory findings which shows that the corrosion prediction model can be applied to the complex corrosion circumstance of oil and gas fields and better results in the analysis and judgment can be obtained.This study offers reference for pipe anti-corrosion prediction in CO2 injection or production.

Key words: CO2 corrosion, numerical model, corrosion mechanism, sensibility analysis, hydrocarbon production