Experiments studying oil-water flows were conducted in a 10-cm diameter, 40-m long, horizontal pipeline. Oil (viscosity 3 cP at 25°C) and ASTM substitute seawater were used at superficial mixture velocities ranging from 0.4 to 3.0m/s. in situ water cut and in situ velocity along the pipe across section have been measured at a temperature of 25°C and a carbon dioxide partial pressure of 0.13 MPa for a whole range of water cut.

A novel mathematical segregated flow model, four-layer/phase was then developed for intermediate oil-water flow patterns of semi-segregated, semi-mixed and mixed as a three-phase model by incorporating experimental data. The mixed layer in the three-layer/phase model is further divided into water-in-oil (oil-continuous) and oil-in-water (water-continuous) layers by the phase inversion point. The experimental data are in good agreement with the predicted water film height from the model.

Subject
Films, Flow patterns, Water, Piping, Viscosity, Corrosion rate, Flow velocity, Pipelines, Dispersion, Mixtures, Pure water, Corrosion modeling, Oil
Keywords:
corrosion, large diameter pipe, multiphase flow, oil-water flow, phase inversion, segregated flow model, three-layer/phase model, four-layer/phase model
© 2002 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2002
Association for Materials Protection and Performance (AMPP)
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