51315-5620-Study of Pitting Corrosion of Corrosion Resistant Alloys at Extreme High Temperature Using Electrochemical Measurements

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Product Number: 51315-5620-SG

ISBN: 5620 2015 CP

Author: Jin Huang

Publication Date: 2015

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A lack of data and models for corrosion and scale at the extreme temperatures and pressures (xHTHP) encountered in ultra-deepwater reservoirs increases the economic and safety risks of offshore production. Corrosion-resistant alloys (CRAs) are commonly used for ultra-deepwater oil and gas production. Those CRAs are usually good to resist uniform corrosion however localized corrosion (e.g. pitting) can always be a big concern for their applications.The present work aimed at evaluating the pitting corrosion tendency of different deepwater operation tubing materials at realistic ultra deepwater temperature (up to 250 °C) and CO2 partial pressure (up to 100 psig) in a static autoclave reactor under different salinity conditions. Electrochemical techniques including linear polarization resistance (LPR) and cyclic polarization measurements were conducted to evaluate the potential of pitting corrosion of different alloys. A methodology to apply vertical scanning interferometer (VSI) to assess severity of localize corrosion was developed as well.Key words: corrosion-resistant alloys cyclic polarization high temperature high total dissolved salt ultra deepwater CO2 corrosion