Ecrin v4.20 - Doc v4.20.01 - © KAPPA 1988-2011
Ecrin Guided Session #1
• Ecr
GS01 - 31/36
Fig. E01.11
• Build-up#2 with all the raw data
In addition to the pressure depletion observed in the history plot, with the radial flow line
(white dotted line on the loglog) placed as illustrated in Figure E01.12 the diagnostic is quite
straightforward: the system is closed and the well is near two faults much closer to the well.
If the radial flow line needs to be moved, click on the white dotted line and drag the line
accordingly.
Note:
the rate history is at this stage of the visit made of about 30 000 values. Before running
any model it is necessary to reduce the number of flow period in order to make the simulation
duration reasonable.
To do so, go to Edit rates, select all the rate data
, open the processing box
, select the
tab ‘Simplify’ and impose a ‘% Delta’ of 5% for rate simplification.
Click on the ‘Test’ button, check that the rate number is reduced to around 2150 points.
Press OK to exit.
After setting the radial flow line, start the interpretation using the automatic model
to
estimate skin and adjust the early time match.
To access this option, select 'Interpretation' and then press Shift +
. A message
indicates that the model is being generated.
Then, open the 'Model' dialog to add the closest faults, using the intersecting sealing fault
option: choose 'Intersecting faults – Any angle' in the Boundary model section.
Add a fault at
950 and 4700 ft
at an intersecting angle of
90°
. Set
kh to 13000 mDft
and
C to
0.011 bbl/psi
and
S to -1
. Run the model clicking 'Generate' and the match
between the model and the data in the loglog plot of Build-up # 2 should be very close.
See Figure E01.13.
1...,23,24,25,26,27,28,29,30,31,32 34,35,36,37,38,39,40,41,42,43,...485