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Doc v4.20.01 - © KAPPA 1988-2011 Guided Session #6: Compositional Thermal Option • RubGS06 - 1/22
Rubis Guided Session #6:
Compositional Thermal model
A01 • Introduction
Rubis v4.20 includes a thermal option developed through a joint effort between KAPPA and
Total. This fully transient option is accessible in single or multiphase; it allows a resolution in
terms of pressure and temperature, with an implicit coupling between the reservoir and the
wellbore. Temperature can be output as a function of time at any depth in the wells, in the
reservoir as temperature fields, or as well logs at a user specified time interval. While we have
run a number of validations between the Rubis model and others in some limited conditions,
we are releasing this model as a non-commercial option of 4.20 in order to extend its usage
and gather user feedbacks.
This guided session shows the following Rubis applications:
• Compositional simulations with an arbitrary number of components where the Peng-
Robinson (with volume translation) equation of State is used for the hydrocarbon
phases.
• Multiphase Thermal simulations taking into account mass and energy balance within the
reservoir and between the reservoir and the wellbore.
B01 • Compatibility
The Composition/Thermal option is compatible with other standard options in Rubis, however
certain restrictions apply:
• The boundary conditions must be limited to ‘no flow’ or ‘constant pressure’ kind (in
which case if fluid is entering the reservoir, its hydrocarbon composition is that of the
block it is entering into).
• The well model must be used (see section C01.5 of this document).
• If injection is considered, it is restricted to either pure water or to the lightest
hydrocarbon component (if the well control is set to Gas Rate).
This document describes how to use these options throughout a case example where a
reservoir with one producer and one injector is considered.
In this example we will set a producer to deplete a closed reservoir in order for the pressure in
the oil zone to drop below the local bubble point, leading to large volumes of gas being
vaporized. We will then re-pressurize this reservoir with water injection in order to observe gas
mobilization and re-condensation in the same zone. We will then stop water injection in order
to observe a warm-back effect around the injector.