4. a reservoir has drainage of 60 acres, 100 ft thickness, and permeability of 20 md. the average pressure is 4000 psi and the bubble point pressure is 4500 psi. assume a drawdown is kept at 1000 psi, and the average reservoir pressure decreases at a rate of 500 psi/year. what is the cumulative oil and gas production for the 3 years? assume skin factor is 5, b = 1.1, u=1.7 cp, relative permeability for oil is 0.4, gor=300 scf/stb and rw = 0.328 ft. 0-0.2, c=10 1/psi