Page 262 - KAPPA - Ecrin v4.30 tutorials

Ecrin v4.20 - Doc v4.20.01 - © KAPPA 1988-2011 Topaze Guided Session #1 • TopGS01 - 16/24
Note that the data sets will be 'extracted' at the times of both pressure and rate histories.
Practically, this means that both data sets will be interpolated if necessary at those times.
When OK is given, a progress bar appears as the pressure correction takes place, and the
analysis plots are created. From that point onwards the analysis will work with, and display,
the corrected pressure values.
If you go to the 'Edit Pressures' tab, however, Topaze will access the wellhead values. If you
make any change affecting the pressure correction (change the intake model, the production
history, the original gauge, etc) Topaze will re-compute the correction.
In addition to the previous plots, Topaze creates the followings: Loglog plot, Blasingame plot,
Fetkovich plot, Normalized rate cumulative plot, Blasingame type curve plot, p-q plot. Note
that the creation is based on the application Settings. In 'Settings-Interpretation', it is possible
to change the default creation.
Fig. C01.8 • Extraction done
Since we have seen Arps and Fetkovich type-curve plots in the previous section, we will delete
them by clicking their close box (at the top right of their title bars). The remaining plots are
reviewed below.
Fetkovich plot
This is a loglog display of rate and cumulative versus time, in real units. The presentation is
similar to that of the Fetkovich type-curve plot, but the new one will serve for a comparison
between model and data. Drag options are implemented for this purpose, and will be
illustrated later.