A horizontal well having a permeability of 0.245 md, a skin factor of -4, and an initial pressure of 2706 psi. Determine the pressure at the wellbore after an 8 hour buildup period with a constant flow rate of 500 barrels per day. Assume that the well is in a reservoir with an initial pressure of 2000 psi and a porosity of 0.25 .... using Horner plot