Non-Magnetic drill collars have been developed to meet requirements of magnetic permeability, strength and galling resistance. Until recently, corrosion resistance has been treated as a secondary consideration. This paper describes recent developments in corrosion resistance in these applications, and the results of comparative testing, using Critical Pitting Temperature testing.

Corrosion resistance generally correlates well with chemistry, and the CPT identifies exceptional cases quite clearly. Recent developments in drill collar materials have markedly improved their corrosion resistance.

Subject
Materials, Corrosion resistant alloys, Composition, Pitting temperature, Drilling fluid, Nitrogen, Salinity, Sensitization, Pitting, Corrosion resistance, Pitting resistance equivalent number, Alloys, Corrosion potential
© 2001 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).
2001
Association for Materials Protection and Performance (AMPP)
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