00047 CO2-CORROSION AND WATER DISTRIBUTION TWO PHASE PIPE FLOW OF HYDROCARBON LIQUID AND WATER

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Product Number: 51300-00047-SG

ISBN: 00047 2000 CP

Author: Arne Valle

Publication Date: 2003

Industry: Pipelines, Tanks, and Underground Systems

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To analyse the influence of a non-corrosive hydrocarbon liquid phase with respect to CO2-corrosion in pipe flow and increase the understanding of use of natural inhibitors in the hydrocarbon liquid phase, an experimental study of corrosion and water distribution on the pipe wall has been carried out. The experiments are performed at partial pressure of 1 atm., temperature 55 °C and 52 mm ID pipe for condensate-water and crude oil-water flow. For condensate-water flow the corrosion and water exposure to the pipe wall were significantly reduced for increasing flowrates for smooth pipe. Down-stream a circular obstacle local corrosion attack and water exposure were observed and the corrosion is similar to single phase pure water. For crude oil a protective asphaltenic layer was formed at low flowrates that reduced the corrosion rate to very low quantities. In addition, water exposed to the crude oil (contaminated with oil droplets) was 35-55 % less corrosive compared to pure water. This is probably due to extracted components from the oil that act as corrosion inhibitors.

Keywords: carbon dioxide, corrosive gas, hydrocarbon condensate, crude oil, water, water wetting, two phase flow