High pressure full size prototype sulfide stress cracking (SSC) tests of C90, C100, and C110 casing were conducted in NACE TM0177 Method A SSC test environment, followed by failure analysis. The NACE TM0177 Method A. SSC test environment was also used to determine smooth tensile sample SSC threshold data for the materials. An alternate environment consisting of 10% H2S and 90% N2 was also used to conduct prototype tests. The Von Mises threshold stress determined from the prototype samples was consistently less than the threshold stress determined by using NACE TM0177 Method A. It is concluded that the NACE Method A test does not provide the lower bound of the threshold stress compared to prototype test samples.

Subject
Hydrogen induced cracking, Test methods, Materials, Manufacturing, Yield stress, Mechanical failure, Test environments, Specified minimum yield, Well casings, Sulfide stress cracking, Plastic deformation, Inclusions, Samples
Keywords:
hydrogen sulfide, casing, sour gas, corrosive, cracking, oil wells, gas wells
© 1996 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).
1996
Association for Materials Protection and Performance (AMPP)
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