In assessing risks of standard sulfide stress cracking (SSC) of low alloy steels under field conditions, the environmental effects in fitness-for-purpose (FFP) testing has focused on the H2S partial pressure, pH, and temperature. To gain information on additional variables, the literature has been reviewed and new test methods developed. Conclusions are presented on the effect of a number of variables, including (1) reduced H2S at high CH4 pressure, (2) flow, (3) solution composition, including the effect of CO2. The focus is the link between corrosion reactions and the resulting level of absorbed hydrogen. Reasons for the lack or correlation between NACE method A tensile tests and fracture mechanics tests with DCB specimens are presented. Laboratory environments are contrasted with the very different environmental conditions of a condensing water phase that occurs following a tubing/connection/packer failure.

Subject
Hydrogen sulfide, Test methods, Corrosion rate, Autoclaves, Sodium chloride, Tensile tests, Acidity, Sodium chloride solution, Solutions, Mechanical failure, Well casings, Localized corrosion, Sulfide stress cracking
Keywords:
C-110, Sulfide stress cracking, DCB, tensile tests, corrosion rate, H-flux, H solubility, CO2, H2S, H2S fugacity
© 2007 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).
2007
Association for Materials Protection and Performance (AMPP)
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