OK someone help me with the chain of thought here.

I know.
1. Reservoir Pressure
2. Wellhead Pressure I need to keep going, bottomhole pressure and so in effect abandonment pressure.
3. CGR
4.porosity/permeability data.
5.A production profile for the reservoir.

1. How do I get (Drainage radius per well) (ASSUME NO FAULT LINES!!!...Tank model)
2. Well deliverability and decline rate (given this data.)

3.