11271 Study of Corrosion and Inhibition of Carbon Steel in CO2 Containing Natural Gas at High Temperature

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Product Number: 51300-11271-SG

ISBN: 11271 2011 CP

Author: Hejian Sun, Muhdi Sujatmiko, Mohanmad Aulia, Josh Davis and Roger Hudgins

Publication Date: 2011

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The Inline Inspection (ILI) data indicated that corrosion has taken place inside the pipeline transporting the wet natural gas containing CO2 at very high temperature. The corrosion inhibitor at the injection rate of 0.47 Liter per MMSCFT (One Pint per MMSCFT) was injected into the pipeline to protect carbon steel from corrosion. The corrosion modeling results showed very high corrosion rate under the operating conditions. The severity of corrosion inside the pipeline detected by ILI was much lower than the corrosion prediction modeling results. The finding in this study showed the passivation film formed under the operating conditions at very high temperature reduced the general corrosion rate. However, addition of the corrosion inhibitor to the testing autoclaves reduced its protection, and increased corrosion rate. A corrosion inhibitor that is compatible with the passivation film is required to protect the pipeline. This study demonstrated how the laboratory data have supported the corrosion mitigation program for a field operation through exploring the mechanism of high temperature CO2 corrosion of carbon steel in a low total dissolved solids (TDS) brine.

Key words: High temperature CO2 corrosion, corrosion inhibition, pitting corrosion, wet natural gas