Cathodic protection (CP) was planned in the design phase for 28 gas wells at Attahaddy Gas Field in Libya to control the risks of external corrosion and hydrocarbon contamination of fresh water formation. Cathodic protection was applied to groups of wells, electrically sectioned from connected flowlines, with a single feeding system protecting up to 4 wells. The paper illustrates the design of the systems and it reports the results of preliminary survey based on E-Log I tests, performed to assess the protection current demand, and the polarization data gathered at commissioning and in first year of operations. Potential measurements, performed in on and instant-off mode, in close proximity to the well head and in remote positions, are reported and discussed. Potential attenuation and profile along the casing are calculated from casing size, protection current and wellhead polarization data.

Subject
Electric current, Cathodic protection, Cathodic potential, Ohmic drop, Free corrosion potential, Flowlines, Wellheads, Attenuation, Well casings, Polarization, Instant off potential, Protection potential, Anodes
© 2006 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).
2006
Association for Materials Protection and Performance (AMPP)
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