Downhole high resolution electrical measurements are described which provide both rate and state information on well casing corrosion. The measurements are a development and extension of the casing potential profile method, overcoming many of the disadvantages of this technique. Novel features include downhole measurement and digitisation for increased accuracy, high vertical resolution, measurement of casing resistance for quantification of current flow and for estimation of casing thickness, and the ability to operate in conductive well fluid and to provide a compensated measurement in such cases. Examples are presented for both unprotected and protected wells, which show how the measurements complement and correlate with those of other survey techniques.

Subject
Electric current, Potential differences, Corrosion currents, Corrosion rate, Corrosion cells, Tools, Electrical resistivity, Fluids, Metals, Anodic current, Well casings, Surveys, Electrodes
© 1988 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).
1988
Association for Materials Protection and Performance (AMPP)
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