51315-5438-Water Wetting Study on Crude Oil Using a Model Oil Blend

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Product Number: 51315-5438-SG

ISBN: 5438 2015 CP

Author: Abdulaziz Alrayees

Publication Date: 2015

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Determining water-in-oil entrainment velocity inside oil transport lines interchangeably denoted as water wetting transition velocity is important for establishing good corrosion management strategies. To determine this velocity a steel surface wettability study is conducted on a model oil blend (43% LVT-200 26% Isopar-V 27% Tufflo-6056 and 4% Aromatic-200) with physical properties that mimic those of an actual crude oil; such properties are an API gravity of 37.5° a viscosity of 7.0 cP interfacial tension of 39.3 mN/m and a water-in-oil contact angle of 131°. Using a doughnut cell wetting measurement apparatus it was found that the presence of isoparaffins naphthenes and aromatics in the blend reduced the water wetting transition velocity by 30% compared to pure LVT-200 and showed very good correlation to the wetting transition of the crude oil itself. The same measurement was repeated with a mixture of the blend and 1% myristic acid a surface-active compound which revealed an alteration in wetting behavior toward oil wetting where water-wetting transition velocity has reduced by 50% compared to the pure blend. Besides the adsorption of surface active compounds the wetting transition is also dependent on the molecular composition of the oil. The empirical data was compared to water wetting prediction models developed by Hinze 1955 Brauner 2001 and Tang 2011. The Tang model was found to give the closest prediction of the empirical data. Such models can be utilized for the design and sizing of pipelines to avoid water wetting stratified flow and subsequent corrosion. Moreoverthey can be used as atool toadjust corrosion inhibition plans in terms of dosage rate and type of chemicals used.