Page 258 - KAPPA - Ecrin v4.30 tutorials

Ecrin v4.20 - Doc v4.20.01 - © KAPPA 1988-2011 Topaze Guided Session #1 • TopGS01 - 12/24
Check the results.
At the top you will see the Arps results, b, Di, qi and the
corresponding ultimate recovery, UR.
Next are the results linked to the transient part of the match:
kh (permeability-thickness product), Re (external boundary
distance assuming a circle).
From Re, an area is obtained and from the input of thickness
and porosity made at the file creation, a Pore Volume PV is
calculated. With PV and the formation volume factor the
Stock Tank Oil Initially in Place (STOIIP) is derived. Finally
the last cumulative value is subtracted from STOIIP to get
the Stock Tank Oil In Place, STOIP.
Fig. B01.19 • Results
The match above is made along the exponential decline (Topaze uses a thick line to highlight
the closest fit). If the Arps analysis is also made with a b value of 0, similar values of ultimate
recovery are obtained.
Return to the main screen after checking the results.
A pressure gauge could be loaded as this stage and Topaze would offer to re-extract, using this
time both information. In order to show the default path, we will however restart a case
from scratch.
Close the file without saving.
C01 • New document with pressures and rates
Create a New file, and in the Init sequence simply change B to 1.2 and the viscosity to 0.3.
Select the Pressures option.
Load the file TopGS01.asc.
Since the format and units are all in
agreement with the defaults, select
Load points.
In the next dialog, the initial value of the
pressure gauge must be set.
Use the icon to set Pinit to the
maximum pressure in the gauge,
5650 psi, and press OK.
Fig. C01.1 • Setting Pinit
Select the Production option.
Load the file TopGS01.rat and remember to select the 'Steps: durations' option.