Abstract
The effects of chloride ion, temperature, pH value, CO2 and O2 on the corrosion induced leakage of the inner wall of crude oil pipeline with the produced water were investigated by electrochemical polarization. The results showed that chloride ion corrosion would gradually experience the smooth invariant stage, the slow rise stage, and the rapid rise stage which due to the chloride ion destroy the corrosion product film. The corrosion rate would reach a maximum when the temperature was 65°C or the pH value was 3.5. O2 was the dominant factor induced the increase of corrosion rate when compared with the effect of CO2. Moreover, long term and periodic (30 consecutive days) electrochemical CO2 corrosion tests suggested that the CO2 corrosion rate reached a maximum at 4days. The obtained results would facilitate the formulation of control measures for pipeline corrosion in the oil field.
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