Influence Factors of Corrosion of Sand Screen Pipeline in Offshore Thermal Production Well

Aiming at the corrosion problem of screen pipeline of thermal production well in offshore oilfield, simulated experiment was used to study the influence of components of injection fluid on the damage of sand screen pipeline under reservoir condition, the probability of screen pipeline corrosion damage was also analyzed. The results showed that in the CO2 corrosion environment containing oxygen, serious localized corrosion occurred in parent tube, and the maximum corrosion rate was at 60 ℃. When the oil temperature was at 60 ℃, CO2/O2 partial pressure ratio was more than 6, gave priority to CO2 corrosion, showed uniform corrosion. When CO2/O2 partial pressure ratio was less than 5, O2 corrosion took priority, platform corrosion and severe localized corrosion occurred in parent tube for a large area. When parent tube and metal wool or metal net were coupled, bimetallic corrosion occurred, thus corrosion rate increased.