CO2 corrosion behavior of commercial carbon and alloy steels in high concentration NaBr aqueous solution, a representative of a high density clear brine used for a completion fluid is studied. It is clarified that CO2 corrosion behavior of carbon and Cr-steels in heavy weight brine is essentially the same as that observed in 5% NaCl. In addition, properties of SCN- type inhibitor are examined. Specially, both localized corrosion (LC) and stress corrosion cracking (SCC) behaviors of martensitic 13Cr steel with API 5AC-L80 grade are also examined by various laboratory SCC tests. In 42 wt% NaBr brine -CO2, it is verified that 13Cr steel is resistant at temperatures below 90°C even with O2 contamination, and/or SCN- type inhibitor addition. Increasing corrosion severity, i.e. increasing temperature, anodic polarization by galvanic coupling with corrosion resistant alloy (GRA), Cl- addition, would result in ductility loss (L/Lo) of 13Cr steel in SSRT test mainly through accelerating nucleation and growth of pits. Under critical conditions containing SCN- type inhibitors, hydrogen embrittlement is rarely related to degradation of L/Lo. 22 to 25% Cr duplex stainless steel and austenitic corrosion resistant alloy are nearly immune to corrosion up to 250°C in NaBr heavy weight brine.

Subject
Pits, Environmental cracking, Constant load, Materials, Degradation, Corrosion rate, Sodium chloride, Corrosion behavior, Corrosion inhibitors, Steel, Brines, Pitting, Stress corrosion cracking
© 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)
You do not currently have access to this content.