Laboratory testing of different types of materials have been traditionally carried out using very severe brine environments. Several types of tables and graphics for material selection have thus been produced. However, relative little effort has been made to correlate actual field performance to laboratory testing.

This paper presents the results of downhole corrosion tests which are needed to evaluate the behaviour of OCTG materials required for the production of heavy crude in steam injection wells containing high amounts of CO2 and H2S. For this application, available laboratory data recommends Cr/Ni resistant alloys.

A field apparatus was designed to test both weight loss and SSCC types of samples. Results are compared to previous laboratory tests carried out by the authors under static conditions and different test solutions.

Field behaviour of carbon steels (API grades J55 and P110) was similar to that in laboratory for the heavy crude environment. No SSCC failures occurred even for P110 steel.

These results indicate the acceptable use of API grade J55 material for heavy crude steam injection wells containing more than 12000 ppm.vol H2S and 3% CO2.

Subject
Test methods, Water, Materials, Corrosion rate, Aqueous environments, Sodium chloride, Partial pressures, Corrosion products, Wellheads, Bubbling, Crude, Steam, Samples
Keywords:
carbon dioxide, hydrogen sulfide, laboratory test, on site testing
© 1990 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).
1990
Association for Materials Protection and Performance (AMPP)
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