CO2 and CO2-rich pipelines are a key part of any Carbon Capture and Storage (CCS) system. Generally flow assurance modeling of these pipelines has been restricted to pure CO2 systems, however natural and anthropogenic sources of CO2 often contain impurities. These impurities can have a dramatic effect on fracture mechanics and also the corrosion threats within the pipelines. Therefore it is important that modeling of flow and phase behavior of the CO2 with impurities is performed.

Modeling of a CO2-rich pipeline is challenging due to the lack of previous experience and the phase behavior of CO2 rich systems. Estimation of transport properties around the critical point and phase boundaries is particularly difficult.

Benchmarked thermodynamic and transport property correlations are available in the public domain, published by the numerous research groups and institutes. The methodology presented shows how these data can be used in a conventional multiphase transient flow assurance package.

The results produced from Flow Assurance modeling following this method are equivalent in accuracy to multiphase hydrocarbon modelling, as typically performed within the oil and gas industry. The methodology is presented in step-by-step detail, highlighting critical challenges and providing workarounds for gaps in existing knowledge. This allows the authors to assess the flow assurance and phase behavior effects on corrosion in a more accurate manner.

Subject
Water, Materials, Thermodynamics, Modeling, Solids, Pipelines, Mixtures, Density, Fluids, Impurities, Carbon dioxide, Flow assurance, Hydrocarbons
Keywords:
CO2 with impurities, CO2 Pipeline, Transient multiphase simulator, Flow Assurance, Thermodynamics, Equation of State, Thermo-physical properties, Phase behavior
© 2012 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).
2012
Association for Materials Protection and Performance (AMPP)
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