Static 65ºC laboratory autoclave corrosion tests of pipeline steels exposed to simulated produced water covered by dilbit, synbit and conventional crudes all showed comparable low corrosion rates. As expected, the oils themselves, in the absence of water, were non-corrosive. Cross-sections of the steel specimens after testing revealed no evidence of hydrogen induced cracking (HIC). Rotating cylinder autoclave tests at 65ºC with typical pipeline oil velocities show no significant difference in corrosion rates in the oils tested, and no evidence of erosion-corrosion. Interfacial tension (IFT) tests showed no significant difference between the two synthetic oils and conventional crude oil with regard to the tendency towards water drop-out in pipeline conditions. Tests of corrosion under deposits indicated no significant differences between the three types of oil. Tests with corrosion inhibitors demonstrated that dilbit can be inhibited more efficiently than conventional crude under the conditions tested.

Subject
Hydrogen induced cracking, Water, Droplets, Corrosion rate, Oils, Autoclaves, Pipelines, Refineries, General corrosion rate, Nitrogen, Steel, Crude, Hydrophobic interaction chromatography
Keywords:
Pipelines, pipeline corrosion, dilbit, synbit, crude oil, autoclave tests, general corrosion, pitting corrosion, hydrogen induced cracking, erosion-corrosion
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2014
GOV
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