Development of experimental techniques, equipment and thermodynamic modelling for investigating systems with high CO2 concentrations

Research output: Contribution to conferencePaper

Abstract

In this communication we present experimental techniques, equipment and thermodynamic modelling for investigating systems with high CO2 concentrations, inclusing gas reservoirs with high CO2 content and/or CO2-rich systems from capture processes. The experimental equipment consists of high pressure (1,000 bar) equilibrium cells operating over a wide temperature (-80 to 200 C), GC, chilled mirror and Laser Hygrometer for water content measurements. A thermodynamic model based on Cubic-Plus-Association (CPA) equation of state has been used in modelling phase behaviour of CO2-rich systems, The hydrate-forming conditions are modelled by the solid solution theory of van der Waals and Platteeuw. The reliability of the thermodynamic model was evaluated using vapour-liquid equilibrium data.

CO2 is a partially polar compound present in may hydrocarbon reservoirs. Its concentration in some hydrocarbon reservoirs is very high, demanding accurate experimental data and thermodynamic modelling. Another important application is modelling phase behaviour and properties of CO2-rich systems from capture processes for transportation and storage.

The results show that the developed model, combined with a reliable database, is a poweful tool for modelling complex systems. The resulting thermodynamic model is able to conduct various calculations , including: gas solubilities in aqueous and non-aqueous phases, water content in CO2-rich systems, hydrate stability zone in the presence of methanol and/or glycols, dehydration requirements for preventing hydrate formation in gas or CO2-rich phase, and a large number of other calculations. The results of the predictions are compared with experimental data, demonstrating reliability of the techniques developed in this work.

CO2 coming from capture processes is generally not pure and can contain impurities such as water. In a typical gas sweetening unit, the acid gas stream will saturated with water. The presence of water can result in ics and/or gas hydrate formation at low temperature conditions and cause blockage.
Original languageEnglish
Pages1-9
Number of pages9
DOIs
Publication statusPublished - Sep 2011
EventSPE Asia Pacific Oil and Gas Conference and Exhibition - Jakarta, Indonesia
Duration: 20 Sep 201122 Sep 2011

Conference

ConferenceSPE Asia Pacific Oil and Gas Conference and Exhibition
CountryIndonesia
CityJakarta
Period20/09/1122/09/11

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