Consider a well that is completed in two zones. Zone 1 is 20 ft thick, has a permeability of 500md, and has a damaged region with a permeability of 50 md extending one foot into the reservoir. Zone 2 is 40 ft thick, has a permeability of 200 md, and its damaged region having a permeability of 40 md extending 6 inches into the reservoir. The well radius is 0.25 ft, the well drains a 40-acre region, and there are no other completion skin effects. What is the overall skin factor for this well? If we injected acid into this well to restore the permeability in the damaged region, what would be the initial distribution of the injected acid into the two layers?