Predictive Model for Corrosion Rate of Oil Tubes in CO2／He S Coexistent Environment Part Ⅰ： Building of Model

Based on an analysis of the existing models of CO2 corrosion in literatures and the autoclave simulative experiments, a predictive model of corrosion rate (γcorr ) in CO2/H2S corrosion for oil tubes has been established, in which γcorr is expressed as a function of pH, temperature (T) , pressure of CO2 ( Pco2 ) and pressure of H2S (PH2S). The model has been verified by experimental data obtained on N80 steel. The improved features of the predictive model include the following aspects: ( 1 ) The influence of temperarare on the protectiveness of corrosion film is taken into consideration for establishment of predictive model of the γcorr in CO2/H2S corrosion. The Equations of scale temperature and scale factor are put forward, and they fit the experimental result very well. (2)The linear relationship still exists between In γcorr and In Pco2 in CO2/H2S corrosion ( as same as that in CO2 corrosion). Therefore,a correction factor as a function of PH2s has been introduced into the predictive model in CO2/H2 S corrosion. ( 3 ) The model is compatible with the main existing models.