Many Oil & Gas fields are sour with H2S partial pressures above 0.05 psi. For such situations, it is critical to employ OCTG qualified for sour service, resistant to SSC. As corrosion processes in acidic environments with dissolved H2S make the testing solution to drift, some standardized test solutions are highly buffered with the acid-base couple acetic acid / acetate. Another method for limiting the pH drift consists by frequent additions of strong acid during the test. The objective of this work is to compare NACE TM0177 Solution B, EFC 16 solution with and without pH adjustment and HLP solution. Thermodynamic calculations for predicting the saturation pH, hydrogen permeation tests, corrosion rates and fine characterizations of iron sulfide scales were performed for being correlated to SSC test results and for understanding the impact on the hydrogen uptake and the protectiveness of corrosion products.

Subject
Materials, Thermodynamics, Electrochemical cells, Precipitation (solids), Composition, Modeling, Corrosion rate, Iron sulfides, Sour environments, Saturation, Corrosion evolution, Acidity, Sodium chloride solution
Keywords:
SSC, OCTG, NACE TM0177 Method A, pH drift
© 2021 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).
2021
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.