Parameters for Dake's D-factor correlation model.
In particular, holds the coefficient 'A' and the exponents 'B' and 'C' of the correlation relation
D = A * (Ke/K0)**B * porosity**C * Ke / (h * rw) * (sg_g/mu_g)
in which
- Ke is the connection's effective permeability (sqrt(Kx*Ky) in the case of a vertical connection)
- K0 is a reference/background permeability scale (1mD)
- h is the effective length of the connection's perforation interval (dz*ntg in the case of a vertical connection)
- rw is the connection's wellbore radius
- sg_g is the specific gravity of surface condition gas relative to surface condition air
- mu_g is the reservoir condition viscosity of the free gas phase.