This paper demonstrates that it is possible to generate in the laboratory corrosion rate data which are reasonably predictive of field performance. In order to reach this objective, previous studies were expanded to include CO2/H2S gas mixtures, and by approximating Arun production conditions relative to temperature, flow rate (shear stress) and hydrocarbon, corrosion and penetration rates very close to those in the field were obtained. It was furthermore observed that these rates increase rapidly with decreasing temperature between 325 and 275°F. The effects are similar in magnitude for the two different L-80 materials used in Arun tubing. However, one of them is more resistant to lower temperatures than the other. This difference in behavior is traced to slight variations in the composition of the two metals. High speed autoclave results are compared with results obtained in two large two-phase flow loops under comparable conditions. A tentative mechanistic explanation is offered. It is also shown that the condensate produced in the Arun field contains natural inhibitors which have helped to protect the production tubing over the past ten years, but not the flow lines.

Subject
Corrosion rate, Iron carbonate, Metal surfaces, Autoclaves, Condensates, General corrosion rate, Tubing, Penetration, Shear, Metals, Corrosion inhibitors, Steel, Hydrocarbons
© 1990 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).
1990
Association for Materials Protection and Performance (AMPP)
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