Question 4 What is the equivalent permeability of four beds in series, having equal formation thicknesses under the following conditions? 1. Harmonic average assuming linear system in series 2. Harmonic average assuming radial system in series, wellbore diameter = 5.0-in. 3. Geometric average, assuming a parallel system (H = L) 4. Weighted average, assuming a parallel system (HL) Bed # 1 2 3 4 Radius, ft K. md 120 15 380 14 530 10 990 8