Surface weathering and dispersibility of MC252 crude oil

TitleSurface weathering and dispersibility of MC252 crude oil
Publication TypeJournal Article
Year of Publication2014
AuthorsDaling PS, Leirvik F, Almas IKjersti, Brandvik P J, Hansen BHenrik, Lewis A, Reed M
JournalMarine Pollution Bulletin
Date PublishedOct 15
ISBN Number0025-326X
Accession NumberWOS:000343951800049
KeywordsOil and Gas Degradation
AbstractResults from a comprehensive oil weathering and dispersant effectiveness study of the MC252 crude oil have been used to predict changes in oil properties due to weathering on the sea surface and to estimate the effective "time window" for dispersant application under various sea conditions. MC252 oil is a light paraffinic crude oil, for which approximately 55 wt.% will evaporate within 3-5 days when drifting on the sea. An unstable and low-viscosity water-in-oil (w/o) emulsion are formed during the first few days at the sea surface. This allows a high degree of natural dispersion when exposed to breaking wave conditions. Under calm sea conditions, a more stable and light-brown/orange colored water-in-oil (w/o) emulsion may start to form after several days, and viscosities of 10,000-15,000 mPa s can be achieved after 1-2 weeks. The "time window" for effective use of dispersants was estimated to be more than 1 week weathering at sea. (C) 2014 Elsevier Ltd. All rights reserved.