Dense phase conditions are expected in several gas export pipelines in deep water fields where high pressure and low temperature can give hydrocarbon gas as a dense phase. Problems with dewatering may introduce a free water phase in the pipeline, so corrosion inhibitors must be used to mitigate CO2 corrosion. Since dense hydrocarbon fluids are good solvents, partitioning of corrosion inhibitors to the dense phase could be a potential problem. A corrosion loop where a dense hydrocarbon phase at 180 bar pressure can be used together with a water phase was used to study the partitioning process. The experiments showed that partitioning to the dense hydrocarbon phase may reduce the inhibitor efficiency somewhat, but no dramatic effects were seen compared to the more familiar situation with oil or condensate.

Subject
Water, Inhibitor performance, Flow loop, Corrosion rate, Glass, Pipelines, Hydrocarbon phase, Corrosion loops, Gas pressure, Natural gas, Partitioning, Corrosion inhibitors, Hydrocarbons
Keywords:
Dense phase, CO2 corrosion, corrosion testing, inhibitors
© 2012 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).
2012
Association for Materials Protection and Performance (AMPP)
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