A compact laboratory-scale high-pressure/high-temperature (HP/HT) recirculating flow loop was developed. This simulation study was conducted on four controlling parameters of the sweet corrosion of L-80 grade downhole tubular by using the HP/HT. An increase of flow velocity increased the corrosion rate predominantly through shear effect and thus determined corrosion morphology of the steel. The stability of an iron carbonate film increased with an increase in temperature and thus temperature had a variable effect on the corrosion rate. Increasing carbon dioxide (CO2) partial pressure increased metal dissolution through reducing the solution pH. Brine chemistry appeared to affect solution pH. The CO2 corrosion mechanism proposed describes the corrosion rate of this steel determined as a function of flow character, iron carbonate (FeCO3) film stability, and metallurgical structure.

Subject
Corrosion rate, Metal surfaces, Iron carbonate films, Flow velocity, Metal dissolution, Partial pressures, Corrosion products, Corrosion attacks, Corrosion morphology, Film formation, Produced water, Steel, Brines
© 1988 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).
1988
Association for Materials Protection and Performance (AMPP)
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