In the oil and gas industry, producing flowlines are subject to various corrosion issues due to the presence of various corrosive elements present in the produced fluids. Dissolved CO2 is an important corrosive element as it causes severe localized corrosion of carbon steel lines. In addition, Microbiologically Induced Corrosion (MIC), which is the impact of microbial presence on internal corrosion can also affect integrity of carbon steel material. In oil and gas industry bacteria can be introduced into surface production facilities during the crude washing process as part of the desalting process. Similarly, secondary recovery by water injection can contaminate the produced fluids typically with Sulfate Reducing Bacteria (SRB). The sudden change in H2S levels in the produced fluids can be one of the indications of such SRB contamination. Under low flow conditions, bacteria can rapidly proliferate and cause MIC on the carbon steel flowlines/pipelines. The localized corrosion by CO2 may get aggravated by MIC due to presence of bacteria. Such observations of flowlines will be discussed here.

This paper presents findings based on physical local evidences, fluid data analysis and microbiological testing data analysis and corrosion morphological features.

Subject
Pits, Water, Leaks, Inspection, Flowlines, Failure analysis, Fluids, Internal corrosion, Produced water, Corrosion data, Deposit corrosion, Microbiologically influenced corrosion, Samples
Keywords:
Flowlines, corrosion morphology, failure mechanism, reservoir, souring
© 2022 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).
2022
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.