Under certain conditions, hydrocarbons may alter the internal corrosion conditions of oil and gas pipelines. In this paper, the effects of hydrocarbons on corrosion have been predicted based on the type of emulsion (i.e., water-in-oil or oil-in-water), wettability (oil-wet, water-wet, or mixed-wet), and corrosiveness of brine in the presence of hydrocarbons. Laboratory methodologies have been developed to determine wettability and to identify the type of emulsion under pipeline operating conditions. Using these methodologies, the wettability and the type of emulsion have been determined for 14 hydrocarbons obtained from operating pipelines. The corrosiveness of brine in the presence of hydrocarbons also has been determined using rotating cage experiments.

Subject
Air pressure, Steel surfaces, Water, Probes, Emulsions, Corrosivity, Wettability, Pipelines, Steel, Brines, Oil, Corrosion coupons, Hydrocarbons
Keywords:
carbon dioxide, corrosive oil, hydrogen sulfide, inhibitory oil, model, oil-wet, prediction, sour corrosion, sweet corrosion, water-wet
NACE International
2007
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