exact balance of layered - related withdrawals of multilayered wells

Dear members,

I have to balance the withdrawal of a multilayered well in order to specify the exact withdrawals from every considered layer.
???

Whats is the best method to get an exact balance of the layer - specific withdrawals for a multilayerd well ?

Best regards, henilein

Since FEFLOW 5.3, the Fluid Flux Analyzer contains an option to estimate the layer-based inflow into multi-layered wells.

Dear Peter,

unfortunately, we use FeFlow 5.012. Is there a workaround.
Till now I think best method is to define circled areas around the well and get the horizontal flux with the fluid flux analyzer into this area for each layer.

Do you know another, maybe better method?

best regards, henilein.

I fully agree with you that this is the best (and easiest) method. I'd try to use a not-to small circle, and I'd also try different diameters to make sure that the result does not depend too much on the circle radius.

Dear Peter,

what's in your opinion the better method to use:

continous or discontinous darcy flux ??

Best regards, henilein.

The built-in method (from FEFLOW 5.3 on) uses the following approach, which I would prefer:
- Create a circle with a radius so that the circle does not touch the elements neighboring the well
- Use the nodal velocity field for the fluid flux calculation
- Do the calculation for all layers
- Sum the fluxes - the result will probably to be exactly the same as the defined pumping rate
- Calculate the percentage of abstraction for each layer using the summed abstractions
- Multiply the percentage with the total defined abstraction for each layer