Prediction Of The Mitigated Corrosion For Inhibitor Applications In Oil And Gas Operations

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Product Number: 51321-16704-SG

Author: J. Sonke; Y. Zheng; J. Moloney

Publication Date: 2021

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Over the past decades, several corrosion prediction models have been developed for Upstream Oil and
Gas process conditions. These models provide the unmitigated corrosion rates in typical sweet or sour
conditions. However, the practice of field operations is typically based on the mitigated corrosion rate.
Therefore, the predicted unmitigated corrosion rates cannot directly be used to understand real-life
situation unless the effect of mitigation is effectively considered. Currently, the mitigated corrosion rate
is typically quantified via a very simplified method (e.g. corrosion inhibitor availability).
Corrosion prediction is designed to look forward and, ideally, should also be part of corrosion and asset
integrity management. For this purpose, a robust analysis of the mitigation practices and methods is
essential. This paper provides an overview of aspects to be considered when predicting mitigated
corrosion rate for the case of continuous corrosion inhibitor (CI) injection as the mitigation barrier. It is
proposed to use a combination of models to calculate the mitigated corrosion rate in a practical and
reliable way. It is recognized that partitioning of the CI among different phases is a key aspect in
relation to the field application of inhibitors. Therefore, guidance is provided to incorporate this as part
of the corrosion mitigation and its prediction.