Nowadays, most sucker rod failures can be attributed to corrosion fatigue. In the light of this fact, various methods have been tried to cope with the corrosion fatigue problem. Generally, corrosion control can be approached in two directions: to reduce the corrosivity of the environment or to increase the corrosion resistance of the material itself. The first approach by chemical treatment of the well was adopted by the oil industry a long time ago. The most popular method is the periodic batch treatment with corrosion inhibitor. A treating rate of 25 ppm on a weekly basis is generally considered to be effective.1  However, in our experience, such a treatment may provide a sufficient protection for downhole tubulars but not for sucker rods. Sucker rods experience corrosion fatigue rather than general corrosion damage. To achieve a significant protection against corrosion fatigue, the inhibitor concentration has to be maintained at such high levels that it may not be practical.2  Therefore, sucker rods will still fail regularly by using the currently adopted treating procedure.

Subject
Coating performance, Corrosion fatigue, Coatings, Materials, Substrates, Nozzles, Spray coating, Rods, Plasma, Stress, Meshes, Steel, Sucker rods
© 1979 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).
1979
Association for Materials Protection and Performance (AMPP)
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