From a viewpoint of easy work-over operation and prevention of pollution, clear brines have been favorably used for the completion fluids. A solution of corrosion problems is important particularly for the safe operation of brines, particularly ones with high specific gravity, because it is seen that the corrosivity is extreme. For the systematical application of completion fluids in deep, high temperature wells, various combinations of brines and inhibitors were examined. Carbon steels with the yield strength of 643MPa to 1166MPa and a series of practical alloys, i.e. 9Cr-1Mo, 13Cr, 22Cr and 25Cray duplex stainless and high Ni austenitic stainless steels were used for test materials. The corrosivity and the environmental degradation was examined. As the results, a recommendation of usage of completion fluids was proposed for the carbon steel casing and tubing strings. A candidate completion fluid for alloys-carbon steels strings was also discussed.

Subject
Completion fluids, Materials, Corrosion rate, Corrosivity, Transgranular stress corrosion cracking, Corrosion behavior, Corrosion inhibitors, Steel, Brines, Carbon steel, Yield strength, Stress corrosion cracking, Alloy steel
Keywords:
Packer fluids, Completion fluids, Corrosion, Stress corrosion cracking, Clear brine, High strength steel, Carbon steel, 9Cr steel, 13Cr steel, Duplex stainless steely Corrosion resistant alloys, Galvanic corrosion, Oil well, gas well, Deep well, Cl−, Br−, Zn2+, Ca2+, Na+
© 1992 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).
1992
Association for Materials Protection and Performance (AMPP)
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