Since oilfield corrosion inhibitors are often complex mixtures of several impure compounds such as amines, fatty acids, reaction products of acids and amines, as well as surfactants and solvents, it is difficult to qualitatively and quantitatively analyze them for proper formulation. In the past, performance criteria on wheel tests were interpreted to indicate proper or improper inhibitor formulation. It is now possible to simplify this difficult task with a method which actually reveals inhibitor composition by using the spectroscopic techniques of carbon-13 nuclear magnetic resonance (13C NMR) and Fourier transform-infrared spectroscopy (FT-IR). These two complementary techniques can reveal considerable qualitative information about the components of an inhibitor. At the same time, a strictly empirical method has been developed which yields semi- quantitative information concerning the proportion of the components used in an inhibitor. This paper describes the use of 13C NMR and FT-IR to ensure the quality of oilfield corrosion inhibitors; specific examples are cited.

Subject
Acids, Acid inhibitors, Inhibitor performance, Functional groups, Imidazolines, Surfactants, Solvents, Corrosion detection, Amines, Amide, Corrosion inhibitors, Oilfields, Samples
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
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