The purpose of this work is to describe the results of corrosion studies for production casing strings subjected to gas lift containing supercritical CO2 (SCCO2) in the pre-salt Brazilian fields. High pressure carbonate reservoirs usually demand CRA for well completions during production. Production casing string uses low alloy steel though, due to CRA high costs. Low alloy steel casings are subjected to sweet corrosion where the packer fluid is located. High corrosion rates are expected in that region. However, the semi-confined space of the annulus region between the production casing and tubing string, and the scale formed in the hot rolling process can significantly aid reducing the corrosive process. This paper shows the results of corrosion tests carried out considering the reduced volume-area ratio of the packer fluid region, the production parameters, and the protective effect of the steel mill scale. The test methodology consisted in a quantitative analysis using laser interferometry and autoclaves with supercritical conditions and reduced volume-area ratio.

Subject
Wear, Water, Materials, Corrosion rate, Autoclaves, Interferometry, Corrosion scales, Oxide scales, Fluids, Weight loss, Steel, Corrosion protection, Samples
Keywords:
Corrosion Resistant Alloys, Carbon Dioxide, Corrosion Rate, Mill Scale
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2023
GOV
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