Erosion-corrosion in gas condensate wells has been modelled using various parameters in the gas and liquid phases. In the gas phase the parameters were liquid entrainment, droplet size, droplet density, droplet velocity and droplet momentum while in the liquid phase the parameters were film thickness, film velocity, insitu pH, saturation pH, delta pH and liquid film flow dynamics. Based on the results obtained, it is most likely that erosion-corrosion occurs when the liquid film is disturbed by flow dynamics, pipe anomalies, or droplet impingement into the film. At this point, the pH at the wall of the pipe drops below the saturation pH and the protective iron carbonate scale is removed or is unable to form. Since the droplet sizes have been calculated to be 10 times thicker than the liquid film, there can be a significant dilution effect when a relatively pure droplet impinges into the moving liquid film. This lowers the concentration the ferrous and carbonate ions at the surface of the pipe.

Subject
Water, Piping, Droplets, Corrosion rate, Walls, Condensates, Gas velocity, Liquid films, Density, Acidity, Liquids, Film thickness, Erosion corrosion
Keywords:
CO2 corrosion, erosion-corrosion, model, erosion parameters
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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