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OA – DF - YB – LB: Thermal Simulation And Interpretation - Part 1
p 9/10
In earlier versions of Emeraude (before v2.60) an original thermal model was introduced
combining a simple enthalpy balance in front of the inflow zones, and a Ramey equation
outside. This model is now referred to as ‘Segmented model’. The Segmented model also
differed in the way the reservoir was handled by considering that any thermal exchanges in
the formation were Joule-Thomson effects, linked to ‘some’ user input pressure drops.
Tests run between the Energy and the Segmented models have shown that there is no physical
explanation for this pressure drop: it is not the layer overall pressure drop, nor the Skin
pressure drop, and knowing this value upfront seems very difficult. Yet, uncertainty on the
reservoir cooling/heating gives an equivalent uncertainty on the determination of the layer
inflows.
In multi-phase, interpretation can only get worse….There is a general agreement that the
inverse problem is undefined in multiphase if the only available measurement is temperature.
The Figure below provides an illustration where 2 distinct contribution splits (track#2 and #3;
bottom zone), cause perfectly matching temperature profiles – all other parameters being
equal. With only the temperature it is clear that it is impossible to choose one solution over
another…
2 distinct O-W splits produce the same Temp profile