The majority of water injection wells are completed with low alloy steel tubing. Downhole completion equipment for use with low alloy steel tubing is made from low alloy steel and 9Cr-1Mo steel. Experience indicates a high rate of corrosion of these alloys in the North Sea areas. Literature recommends the use of high molybdenum containing alloys for corrosion resistance in marine environments. 13Cr stainless steels have been used in deoxygenated water, with some degree of success; however occasional pitting and crevice corrosion has been experienced. Nickel chrome alloys with high molybdenum provide excellent corrosion resistance in sea water, but are not cost effective. Cost effective alternative materials for completion equipment are evaluated. These include duplex stainless steels and thin film coatings on 13Cr and 17Cr stainless steels. Duplex stainless steels show encouraging results. Thin film coatings or plating may not provide total corrosion protection but pitting can be minimized with proper coating selection and application. These cost effective alternatives are discussed with experimental test results.

Subject
Costs, Water, Coatings, Corrosion resistant alloys, Stainless alloys, Nickel based alloys, Crevices, Tubing, Crevice corrosion, Equipment, Pitting, Corrosion resistance, Stainless steel
Keywords:
Sea Water Injection, Oxygen Corrosion, Chloride Attack, Completion Equipment, Coatings, CRA, Nickel Alloy, Stainless Steel, Martensitic Stainless Steel, MIC
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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