Fluid Model QC

In our fluid model overview, there are several options available to us. This section focuses on the 'Quality Checks' in the topright tab, next to 'Black Oil Tables, illustrated below.

This feature allows us to verify that we do not have any non-physical behaviour for our properties.

Input

The calculation will require a temperature, and a feed composition. We could utilize the reservoir temperature, and simply copy the composition from one of the samples in 'Adjusted Compositions' as shown below.

By doing this, we ensure that the PVT sample composition we utilize matches that of the Fluid Model components. If we utilize the 'Edit' button here, we can open a pop-up to easily copy the composition to our clipboard.

Results

Pasting that into the seed-feed and running the quality check, will generate the following results

We could then make sure our critical pressures and temperatures are within the physical range, by checking if our EOS properties are within the two ranges of pure components (acting as lower and upper boundaries). This is also true for our Normal Boiling Point and Acentric Factors.

K-Values

For the K-values, we want to make sure that none of the lines generated are crossing each other, as this would imply some errors here.

Finally, we want to ensure the LBC Polynomial graph is monotonic (no change in y-axis direction along the x-axis). We see the graph below has ever increasing values for the y-axis along the increasing values for x-axis, indicating it looks good. The deviation we see between the Default LBC Polynomial and the Current LBC Polynomial, is simply our decision to tune the LBC P4 value.

## Next Steps

Once the fluid model has been QC'd, the next step in the fluid model development is to Get Your Certificate!!