This tutorial shows how to:
Compare a discharge simulation with a measured discharge profile at the same mass flowrate (a process called matching analysis).
Improve the discharge simulation by altering its parameters and rerunning it until it more closely matches the measured discharge profile at the same mass flowrate.
After you have done this, you might be able to further improve a discharge simulation by allowing for formation temperatures and any secondary feedzones see here.
This tutorial uses:
The measured discharge profile
W:100 t/hr that you should have entered earlier.
The discharge simulation
TD 100 t/hr that you should have entered earlier.
TIP: When you look at a discharge simulation it is usually best to display it as a graph.
Right click the discharge simulation you ran earlier,
TD 100 t/hr and click
Copy. WellSim creates a copy of the discharge simulation.
Right click the copy of the discharge simulation,
Copy of TD 100 t/hr and click
Change the description to
Better TD 100 t/hr.
Don't save the new discharge simulation yet ...
Note that the discharge simulation and the measured discharge profile must be at the same mass flowrate.
Click to display a graph.
Measured Profile dropdown list, choose the measured discharge profile that you entered earlier,
Visible. The graph now shows the measured discharge profile at the same flow rate as the discharge simulation:
If your graph does not look like this, change it.
The discharge simulation matches the measured discharge profile reasonably near the top, but deeper the measured temperatures and pressures are consistently less than the discharge simulation's.
WellSim displays the matching analysis for the graphs:
This shows the statistical differences between the discharge simulation and the measured discharge profile.
The lower bound analysis tutorial suggests that the CO2 concentration in this well is about 5,200 ppm (in total fluid), which is more than the 4,000 ppm assumed for the discharge simulation. I reran the discharge simulation for higher values of CO2 and found that 4,800 ppm gave a close match to the measured discharge profile:
CO2 [ppm] to 4800.
The two sets of graphs now match more closely:
Click again to display the new matching analysis:
This shows a closer match than the first matching analysis, above.
You could try changing other discharge simulation parameters to get a closer match. However, this is probably close enough.
Click to save the new discharge simulation
Better TD 100 t/hr.
You can sometimes further improve a discharge simulation by allowing for formation temperatures and any secondary feedzones see here. In this case this probably won't improve the discharge simulation much, because: