Batch inhibition treatment of oil and gas pipelines is one of the options used to treat top of the line corrosion in CO2/H2S containing wet hydrocarbons. This treatment efficiency largely depends on the inhibitor performance and the treatment frequency. The latter is seldom determined based on the inhibitor film persistency among other operations-related constraints. It is within this framework that the present study is targeted to present a new laboratory test method to assess the performance of batch corrosion inhibitors and predict their film persistency. The newly designed apparatus offers several advantages over the commonly used ‘dip and drip’ method, including building the inhibitor film in-situ, applying a chosen wall shear level during the building and the stripping steps, monitoring the persistency through Linear Polarization Resistance (LPR) measurements of the corrosion rate, replenishing the fluids at a chosen frequency through a computer controlled device and providing weight loss coupons for localized corrosion assessment. The method has been applied and is illustrated to demonstrate the capabilities and the dynamics of the new set up.

Subject
Test methods, Electrochemical cells, Corrosion rate, Inhibitor films, Weight loss coupons, Film persistency, Stripping, Persistency, Rectifiers, Weight loss analysis, Corrosion inhibitors, Brines, Linear polarization resistance
Keywords:
corrosion inhibitor, batch, persistency, CO2 corrosion, LPR
© 2010 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).
2010
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.