Corrosion control in CO₂/H₂S-produced water of offshore oil fields

Abstract

Purpose

In order to solve the corrosion problems in the South China Sea, the purpose of this paper was to study the main influences of corrosion including temperature, H₂S content and corrosion inhibitor content in CO₂/H₂S oil field-produced water.

Design/methodology/approach

The corrosion products formed on the steel surface were observed and analyzed using scanning electron microscope (SEM) and X-ray diffraction (XRD).

Findings

The results indicate that temperature significantly influences the corrosion rate, which is a maximum at 70°C. The corrosion rate decreases as H₂S content increases which is less than 10 mg/L, but then it increases rapidly. The FeCO₃/Fe _x S _y protective film and a corrosion inhibition also were considered.

Research limitations/implications

A mixture containing an imidazoline derivate and an organic amine can enhance the corrosion resistance of the corrosion product film.

Practical implications

A mixture containing an imidazoline derivate and an organic amine can enhance the corrosion product film corrosion resistance.

Social implications

Imidazoline is one kind of environmentally safe agent which can be used in the ocean.

Originality/value

The corrosion can be controlled to a satisfactory extent in the presence of a mixture containing an imidazoline derivate and an organic amine.

Citation

Lu, Y., Zhang, Y., Liu, Z., Zhang, Y., Wang, C. and Guo, H. (2014), "Corrosion control in CO₂/H₂S-produced water of offshore oil fields", Anti-Corrosion Methods and Materials, Vol. 61 No. 3, pp. 166-171. https://doi.org/10.1108/ACMM-02-2013-1240