Flush mounted electrical resistance probes and linear polarisation resistance (LPR) probes were installed in a horizontal pipe used for test production of a subsea oil well in the North Sea. Corrosion rates were also measured in the laboratory under nominally the same water chemistry in a glass cell filled with synthetic or with real formation water. A good agreement was obtained between the corrosion rate measurements in the field and in the laboratory, despite a much higher flow rate in the pipeline in the field. The response of the corrosion rates to variations in water chemistry, CO2 partial pressure and temperature was examined in the glass cell. The observed corrosion rates are compared with results of calculations based on published equations for the treatment of the pH effect on "sweet" corrosion.

Subject
Water, Materials, Composition, Corrosion rate, Predicted corrosion rate, Precipitates, Pipelines, Water chemistry, Partial pressures, Acidity, Brines, Electrical resistance probes, Linear polarization resistance
Keywords:
Carbon steel, corrosion, oil production, formation water, carbon dioxide, corrosion monitoring
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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