Laboratory Tests Comparing the Corrosivity of Dilbit and Synbit with Conventional Crudes under Pipeline Conditions

摘要

Static 65°C 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 65°C 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.