The high temperature Tyrihans field required an expandable liner for dual lateral production wells. The tubing material selected for Tyrihans production wells is alloy UNS S41426 (grade 110ksi). Since the expandable liner is directly exposed to reservoir fluids, the material needs to meet the same corrosion and environmental cracking performance as the tubing. The initial program attempted to qualify alloy UNS S41426 (grade 80ksi). Mechanical property analysis and expansion trials (ID ratio of 19.8%) concluded this alloy to be unsuitable for the required expansion ratio. Alternative alloys, UNS S31603 and UNS N08904 were selected for evaluation via expansion trials and environmental cracking tests in simulated Tyrihans well completion brine and reservoir fluid. 4 Point Bent Beam (4PBB, longitudinal) and C-Ring (transverse) tests on post-expanded alloys were conducted in high chloride-containing environments, with and without CO2/H2S. The results proved the suitability of the alloys through expansion trials, but UNS S31603 revealed susceptibility to corrosion attack if oxygen is introduced into the system.

Subject
Environmental cracking, Test methods, Materials, Piping, Materials performance, Autoclaves, C ring stress corrosion testing, Test environments, Tensile stress, Brines, Oxygen, Alloys, Chlorides
Keywords:
corrosion resistant alloys, austenitic stainless steel, nickel alloy, solid tubular expansion, corrosion, H2S, sulfide stress cracking, environmental cracking, cold working
© 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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