Corrosion investigation of J55 steel under simulated enhanced oil recovery conditions using CO 2 flooding

Abstract

The present work investigated corrosion behaviour of J55 tubing steels and solution equilibrium chemistry of the produced water under simulated CO₂ flooding environments at various temperatures. The corrosion rates were calculated by weight loss method carried out with or without one kind of imidazoline based inhibitor in autoclave. Surface morphologies of corrosion product films formed on samples were analysed using scanning electron microscopy (SEM). Meanwhile, the concentrations of main solution species in experimental produced water were tested. The solution equilibrium chemistry of dissolved CO₂ in the produced water was also calculated and analysed. The results indicated that corrosion rate of J55 significantly increased when temperature exceeded 55°C and greatly decreased with the effect of inhibitor especially when the imidazoline based inhibitor exceeds 150 ppm, σ Fe concentration increased with the increase in temperature, especially when temperature exceeded 44°C. The H₂CO₃ concentration declines by about 3 orders of magnitude compared to CO₂(aq) concentration and the yielded HCO₃ ⁻ concentration is about 0·2-0·35 times of the H₂CO₃ concentration.

Keywords

Corrosion rate Inhibition efficiency Corrosion product film Solution equilibrium chemistry

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