4. A new well has been drilled in a closed reservoir and drawdown test was run. Use the log-log and the semi-log plots to estimate the radius of investigation at the end of Wellborn Storage given the following formation and fluid properties: Data: Oil Production Rate, 4, 400 STB/D; Total Compressibility, c. 1x10-psi-1: Oil Viscosity, , 1.0 cp: Oil Formation Volume Factor, B. 1.2 bbl/STB: Reservoir Permeability, k 100 mD: Formation Thickness, h. 20 ft; Initial Reservoir Pressure, p. 2.000 psia: Formation Porosity, 0, 0.25; Wellbore Radius, tw 0.25 ft. 1700 1650 1600 1550 Pressure (psia) 1500 1450 1400 1350 0.01 0.1 100 1000 1 10 Time (hours) 1000 IP-Pur] (psi) 100 10 0.01 0.1 100 1000 1 10 Time (hours)