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Four-Phase Equilibrium Calculations of Carbon Dioxide/Hydrocarbon/Water Systems With a Reduced Method
- Saeedeh Mohebbinia (University of Texas at Austin) | Kamy Sepehrnoori (University of Texas at Austin) | Russell T. Johns (Pennsylvania State University)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- July 2013
- Document Type
- Journal Paper
- 943 - 951
- 2013. Society of Petroleum Engineers
- 5.2 Reservoir Fluid Dynamics, 5.2.1 Phase Behavior and PVT Measurements
- 3 in the last 30 days
- 377 since 2007
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Three hydrocarbon phases can coexist at equilibrium at relatively lowtemperatures in many carbon dioxide (CO2) floods. The formation ofan aqueous phase in contact with hydrocarbon phases is inevitable in almost allrecovery processes, because of the permanent presence of water in thereservoirs either as injection fluid or as initial formation water. As thenumber of phases increases, flash calculations become more difficult andtime-consuming. A possible approach to reduce the computational time of thephase equilibrium calculations is to use reduced methods. This paper presents ageneral strategy to model the phase behavior ofCO2/hydrocarbon/water systems in which four equilibrium phases occurby use of a reduced-flash approach. The speedup obtained by a reduced-flashalgorithm compared with the conventional flash approach is demonstrated for adifferent number of components and phases. The results show a significantspeedup in the Jacobian-matrix construction and in Newton-Raphson (NR)iterations by use of the reduced method when four phases are present. Thecomputational advantage of the reduced method increases rapidly with the numberof phases and components. The developed four-phase reduced-flash algorithm isused to investigate the effect of introducing water on the phase behavior oftwo west Texas oil/CO2 mixtures. The results show changes in thephase splits and saturation pressures by adding water to theseCO2/hydrocarbon systems.
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