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Ecrin v4.30 - Doc v4.30.01 - © KAPPA 1988-2013 Rubis Guided Session #7 • RubGS07 - 1/19
Rubis Guided Session #7:
Compositional Isothermal model
A01 • Introduction
The compositional isothermal model detailed here allows simulations with an arbitrary number
of components where the Peng-Robinson (with volume translation) equation of state is used
for the hydrocarbon phases. The water phase is then treated separately by mean of
correlations; it is considered immiscible, and no gas dissolution in it is allowed. The boundary
conditions must be limited to ‘no flow’ or ‘constant pressure’ kind. Note that this formulation is
not simply an extension / reduction of the compositional thermal model: beyond the obvious
fact that less variables are needed (there is no temperature equation anymore…), the problem
equations are now such that massive parallelization of the flash calculations can be achieved
when the simulation is performed, leading to a modeling much faster than thermal modeling
cases.
In this example we will set a producer to deplete a closed reservoir filled with gas condensate
and oil. Lean gas is being injected in the underlying oil zone leading to a large pressure
support preventing the gas gap to dive below the dew point. In a second run the injector is not
started and comparisons of the runs show that recycling of the lean gas allow for a much
larger oil recovery.
B01 • Document Creation, PVT Initialization
Create a new Rubis document by clicking and accept all defaults in the Reservoir – field infos
dialog:
Fig. B01.1 • ‘Field Infos’ dialog