Life extension of fields due to enhanced recovery methods and the development of increasingly remote resources has resulted in pipelines being used in very different circumstances to those for which they were designed. There are often large discrepancies between the current operating envelope and the original design conditions. Extension of field life has resulted in pipelines carrying changing fluids compositions beyond the original design life. In order to ensure future integrity of these pipelines, all of these changes in operation need to be assessed/reported and a full understanding of current condition of the pipeline defined. A good appreciation of current conditions, together with future operating conditions and therefore the likely internal corrosive condition of the pipeline can enable forward predictions on pipeline life to be estimated.

This paper give details of an uncertainty based probabilistic approach that enables the internal corrosivity of a pipeline to be assessed under varying operating conditions. This approach enables the risks associated with future maintenance options to be quantified.

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