Gas production wells in the Mobile Bay area of Alabama have utilized materials with high resistance to corrosion and environmental cracking as a result of the high temperature and the levels of H2S, CO2 and Cl in the produced fluids.

Selection of materials having sufficient strength in the required cross-sectional areas has been limited. The performance of the available alloys is questionable at the higher operating temperatures expected in new developments.

Alloy C-276 (UNS N10276) is recognized for its corrosion/cracking resistance but has not been available in the required cross sections at needed strength levels for manufacture of, for example, a Surface Controlled Subsurface Safety Valve (SCSSV). A manufacturing process has now been developed, and SCSSV’s have been manufactured for use by a major oil company.

This material will allow production from existing wells at increased rates and will allow development of new wells that are expected to have increased flowing temperatures. The selection of the material, its mechanical and corrosion properties, and the manufacture of a SCSSV are discussed.

Subject
Test methods, Materials, Manufacturing, Materials performance, Valves, Machining, Elongation, Health, safety, and environment, Environments, Risk reduction, Alloys, Yield strength, Slow strain rate technique
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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