image
image
Emeraude v2.60 – Doc v2.60.01 - © KAPPA 1988-2010
Guided Interpretation #3
•
B03 - 7/11
B03.3 • Interpretation with the ‘Continuous’ method
The ‘Continuous’ method differs from the ‘Zoned’ method in seeking in the Global Regression
an agreement between the schematic logs and the data everywhere, and not just on the
calculation zones. If we look at the previous Figure B03.7, we see that schematics are ...
schematic, i.e. they do not show much variation outside inflow zones. This is linked to the fact
that holdups are controlled by the slip model predictions. In order to give the schematics the
ability to reproduce the local variations seen on the data, the ‘Continuous’ method treats the
holdups as variables (in addition to the rates) but constrains them by the slip model holdup
predictions. In other words, the holdups are freed but the process tries ‘not to go too far’ from
the slip model prediction.
Create a new interpretation from Interpretation #1 (default choices). Do not tick ‘All
elements’ as we would retrieve the current solution as well, and here we want to restart
from scratch, keeping the position of the calculation zones, but not the solution.
Select the ‘Continuous’ method and keep an Init based on ‘Zone local values’.
There are
some settings associated with the Continuous method which you can check with . They
represent additional constraint on the slippage velocities.
Click on and uncheck ‘constrain slippage sign’.
Close the window with OK.
‘Zone Rates’ is renamed ‘Inflow Rates’ to emphasize that the ‘Continuous’ methods is really
about solving at once for the inflows, rather than solving the zones individually.
Click on ‘Inflow Rates’.
A first solution has been obtained, based on a series of local regressions. The difference
with the ‘Zoned’ approach so far is that holdups were treated as variables while the slip
models were used as constraints. This first solution is in any case not the one we are after
since the Continuous method really aims at running the Global Improve.
Check the ‘Match surface conditions’ box.
Set the ‘Bottom’ zone to ‘Closed’ by clicking in the ‘Contribution’ column.
Move the window to see the changes in the schematics as the regression is going on.
Click on ‘Global Improve’. The schematics are updated after each iteration and the
successive rates are seen on the QZT and QZI tracks.
Validate the Inflow Rates results with OK.