Exxon identified a need for highly corrosion-resistant precipitation-hardening alloys for use in down hole gas well equipment for severely corrosive environments, such as Mobile Bay. The Exxon fields are expected to contain up to 9.8% hydrogen sulfide with bottom-hole temperatures reaching 420°F (216°C). UNS N07716 was evaluated and specified for use in tubing-retrievable, surface-controlled, subsurface safety valves (TRSV). This paper reviews the service conditions and specific application as well as the processing and testing of UNS N07716 to qualify the material for this application. Slow strain rate test (SSRT) and C-ring data are provided in elevated-temperature sour environments.

Subject
Test methods, Materials, Corrosion resistant alloys, Valves, Sour environments, Sodium chloride, C ring stress corrosion testing, Heat, Pitting, Corrosion resistance, Heat treatment, Aging, Slow strain rate technique
Keywords:
hydrogen sulfide, Mobile Bay, deep, sour gas wells, subsurface safety valves, UNS N07716, slow strain rate tests, C-ring tests
© 1992 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).
1992
Association for Materials Protection and Performance (AMPP)
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