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Ecrin v4.12 - Doc v4.12.02 - © KAPPA 1988-2009
Topaze Guided Session #1
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TopGS01 - 19/25
p-q plot
This plot displays a simple cross plot of pwf vs. q. On this plot, infinite acting radial flow is
diagnosed as a negative slope section while pseudo steady state should exhibit a positive line.
Furthermore, the slope of the PSS section is inversely proportional to the volume drained. This
plot may thus be used as a diagnostic tool to detect compartments.
C01.2 • Loglog match point
Maximize the loglog plot.
Two lines have been set automatically by Topaze on the plot: a horizontal line, corresponding
to radial flow and giving an estimate of kh, and a unit slope line, set through the boundary
dominated flow period, and providing an estimate of Re.
Check the results. They include kh and Re thus obtained. Re is used to calculate the pore
volume (PV) hence the STOIIP (Stock Tank Oil Originally In Place) and current STOIP (Stock
Tank Oil In Place) subtracting the last known cumulative.
By click and drag on the plot, you can change the line position, and see the results being
updated. If you move the match, you can reset it to the original position with
the 'Reset Match' icon .
Fig. C01.10 • Loglog match results
Note the specific loglog options accessible in the toolbar:
Reset match: restore the original position of the match lines.
Smoothing: change the smoothing used for derivative calculations.
Change the pressure function in display, Normalized pressure, or Normalized
pressure integral.
Leave the loglog plot and return to the main screen.