Analysis of the pressure build up test data for Blackstone Basin Oil field indicates that the pay zone has a permeability of $150mD$ and a uniform thickness of $38ft.$ The well drains an area of approximately $50$ acres. It is producing at a steady rate of $500ST/$Day at a stabilized bottomhole flowing pressure of $100$atm. The following additional data is available:

$R_w=0\mathrm{.}30ft$;$B_o=1\mathrm{.}35bb\frac{1}{S}TB$;$u_o=2\mathrm{.}5cp$