In high pressure high temperature (HPHT) gas condensate wells the use of high density brines is required to ensure safe well operations during both well drilling and completion phases. Caesium formate brine is the latest high-density brine to be used for this application, with the claim that it is both environmentally friendly and none corrosive.

This works presents the results of both corrosion and stress corrosion cracking tests performed with caesium formate brine in simulated HPHT conditions

The materials tested were low alloy steel grades P-110 and C-110, five supermartensitic stainless steels (S13Cr) grade 110 ksi, galvanized carbon steel wireline, duplex stainless steel wireline and alloy 718. These materials were tested as single corrosion coupons and four point bent beam specimens.

The test conditions were selected to represent future HPHT Field developments in the Norwegian Continental Shelf.

The results of the test program undertaken show that relatively low corrosion rates were observed on low alloy steels and somewhat higher than expected corrosion rates on the S13Cr in the caesium formate brines. Furthermore, the susceptibility to stress corrosion cracking and localized corrosion was negligible.

Subject
Air pressure, Materials, Corrosion rate, Wirelines, Formates, Autoclaves, Wiring, Steel, Brines, Risk reduction, Alloys, Stress corrosion cracking, Samples
Keywords:
Caesium formate, general corrosion, localised corrosion, Stress Corrosion Cracking (SCC), heavy brines, CRA’s, supermartensitic stainless steel, hydrogen embrittlement
© 2004 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).
2004
Association for Materials Protection and Performance (AMPP)
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