Abstract
Abstract The ability to optimise the use of carbon steel in sour service presents many economic advantages, including minimizing the use of expensive corrosion resistant alloys, enabling optimised large bore completions, and eliminating additional offshore facilities. An integrated approach to corrosion modeling and testing has been developed to reliably extend the application of carbon steel. Key elements of this integrated approach include:rigorously establish tubular environmental conditions,accurately simulate environmental conditions (acid gas concentrations (CO2/H2S), water cut, and water composition) in the laboratory,mathematically extrapolate laboratory weight loss and pitting to predict tubing life, andvalidate tubing life predictions with field caliper data. This paper describes the application of the integrated approach to evaluate L80 tubular corrosion and predict tubing life for a range of acid gas (CO2/H2S) concentrations. The paper also discusses the corrosion mechanisms and validation of predicted corrosion with field caliper data.
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