Page 200 - Principles of Applied Reservoir Simulation 2E

Part II: Reservoir Simulation 185

that is in the literature, but the commissioner of the study may have a philosophi-
cal or empirical objection to the method. Window area modeling is a good
example of a method that may be reasonable but not acceptable because failure
to adequately describe flux across window area boundaries can yield poor results.
If someone in a position of authority or influence has had a bad experience with
the modeling method, they may refuse to accept results from the model.
Similarly, the modeler needs to be aware that some modeling methods are not
universally accepted. At the very least, alternative methods may be needed to
corroborate the disputed method as part of a sensitivity analysis or model
validation exercise.

Exercises

Exercise 18.1 (A) Run EXAM6.DAT and plot average reservoir pressure as a
function of time. (B) Multiply the pore volume of data set EXAM6.DAT by 0.9
and repeat part A. (C) How does the change in pore volume affect pressure as
a function of time?

Exercise 18.2 Double the horizontal permeability in layer K = 1 of data set
EXAM6.DAT. (A) Plot the average reservoir pressure as a function of time. (B)
What is the effect on production, by layer, at the end of two years? File
WTEMP.WEL provides rate information by layer for all wells.

Exercise 18.3 Set the x direction transmissibility to 0 between 1 = 2 and 1 = 3
for blocks ranging from J = 1 to J = 4 in layers K = 1 and K = 2 of data set
EXAM6.DAT. This transmissibility barrier represents a flow barrier such as a
sealing fault. How does the barrier alter flow patterns and the distribution of
reservoir pressure?