51312-01745-Challenges Associated with Flow Assurance Modelling of CO2-Rich Pipelines

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Product Number: 51312-01745-SG

ISBN: 01745 2012 CP

Author: George Winning

Publication Date: 2012

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CO2 and CO2-rich pipelines are a key part of any CCS system. Flow assurance modelling of these pipelines has been restricted to pure CO2 systems to date 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. It is therefore important that modelling of flow and phase behaviour of the CO2 with impurities is carried out accurately.Modelling of a CO2-rich pipeline is challenging due to the lack of previous experience and the phase behaviour of CO2 rich systems. Estimation of transport properties around the critical point and phase boundaries is particularly difficult.Benchmarked thermodynamic and transport property correlations is available in the public domain published by the European Gas Research Group (GERG) and the National Institute of Standards and Technology (NIST Physical and Chemical Properties Division). The methodology presented shows how this data can be used in a conventional multiphase transient flow assurance package such as OLGA.The results produced from Flow Assurance modelling 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 us to assess the flow assurance and phase behaviour effects on corrosion and integrity in a more accurate manner.