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PublisherNACE InternationalLanguageEnglish
Document ID 2012-1745
Content TypeConference Paper
TitleChallenges Associated With Flow Assurance Modeling of CO2-Rich Pipelines
AuthorsSung-Oh Yang, Denis Akhiyarov, Dale Erickson, MSi Kenny; George Winning, Wood Group Integrity Management
SourceCORROSION 2012, March 11 - 15, 2012 , Salt Lake City, Utah
Copyright2012. NACE International
KeywordsCO2 with impurities, CO2 Pipeline, Transient multiphase simulator, Flow Assurance,Thermodynamics, Equation of State, Thermo-physical properties, Phase behavior
PreviewABSTRACT 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. INTRODUCTION Numbers of onshore CO2 pipeline have been operated in the western USA for decades. The operating regime for offshore pipelines is likely to be more severe than for any existing onshore CO2 pipeline systems. Use of proper thermo-physical properties in modeling is important in designing offshore CO2 pipeline.1, 2 However, it is well known that CO2-rich phase behaviors are not well predicted by traditional cubic equation of states and are erroneous in two-phase region near to supercritical point, which are normal operation conditions.3
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