A computational procedure for predicting CO2 corrosion rates of carbon steels given the field conditions (e.g. CO2 partial pressure, temperature, velocity, solution composition, gas/liquid ratio) is desirable for use by the oil and gas industry. A model based on the current understanding of the mechanism and kinetics of the CO2 corrosion process has been developed. Starting from first principles, a computer program based on this model has been developed for predicting uniform CO2 corrosion rates in single phase flow in pipes in the absence of scale formation. An overview of the CO2 corrosion model and mechanistic aspects involved in this procedure are provided. CO2 corrosion rate predictions obtained using this program for various conditions (of velocity, CO2 partial pressure, pH and geometry) compare well with experimental data for similar conditions. This procedure provides a foundation which can be generalized to more complicated systems involving multiphase flows containing water, oil and gas. The computer program involves solving highly coupled non-linear equations. Program outputs include surface concentrations of the various chemical species at the given conditions which can be used to predict corrosion scale formation on the surface.

Subject
Piping, Corrosion rate, Predicted corrosion rate, Metal surfaces, Electrochemical reactions, Corrosion reactions, Partial pressures, Mass transfer, Anodic reactions, Experimental data, Corrosion modeling, Scale formation, Steel
Keywords:
corrosion, CO2 corrosion, CO2 corrosion modeling, CO2 corrosion prediction, corrosion prediction, steel corrosion, corrosion mechanism
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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