please,,
I want to determine the CBM production curve by manual calculation.
equations were used to it?
: Putus asa:

from king's paper

1 Well Radius rw 0.5 ft
2 External Radius re 500 ft
3 Seam Thickness h 6 ft
4 initial production rate Qg 20 Mscf/d
5 Initial Seam Pressure Pi 500 psia
6 Seam Temperatur T 70 °F
7 Macropore Permeability Ka 3 md
8 Macropore Porosity por 1 %
9 Macropore Diffusion Constant Da 0.177 ft2/D
10 Time Constant 231 days
11 Langmuir Volume Constant VL 18.6 scf/ft3
12 Langmuir Pressure Constant PL 167.5 psia
13 Initial gas content VE 13.9 scf/ft3
14 Production time ti 90 days

Any help appreciated.