Introduction
Tutorials
Improving a discharge simulation
This tutorial describes running a Test Data output simulation, which uses measurements and estimates at the well bottom.
This tutorial uses:
The injectivity simulation TestData - from test rate data 1 that you should have entered earlier.
The output simulation From better TD 100 t/hr that you should have entered earlier.
A Test Data output simulation requires the deepest feedzone factor(s) and reservoir pressure. You normally find these from completion test data:
This tutorial assumes you have done this; and the resulting injectivity simulation TestData - from test rate data 1 gives estimates of the linear drawdown factor at the deepest feedzone, 0.115 bar/t/hr, and reservoir pressure, 207.5 barg.
Assume you have estimated the other data required:
| Data at deepest feed | Use |
|---|---|
| Drawdown relationship | Linear |
| Flow regime | Liquid |
| Enthalpy | 1520 KJ/Kg |
| CO2 | 5,000 ppm in total fluid |
| NaCl | 0 ppm in total fluid |
In the sample database, open a new output simulation for 
.
Enter this data (which includes the data from above):
Run and save the output simulation.
In MY WELL's Output simulations, tag 
:
From injectivity - Test rate data 1 - the one you just ran
a TopDown output simulation, such as From better TD 100 t/hr.
Click 
to compare these:
The curves agree to within about 4 barg.
Note that normally you won't be able to compare a TestData output simulation curve with anything. Because the reason you run it is so you can get an output curve using completion test injection measurements, before you can calculate an output curve by other methods.
Repeat the output simulation above, but use the reservoir pressure assumed for the topdown output simulation (From better TD 100 t/hr) of 200 barg.
To get a feel for the sensitivity of all this to measurement errors, repeat all the steps (measured injectivity curve, injectivity simulation, output simulation) and change some data slightly.