In Appendix C the initial reservoir pressure is 4613 psi. Suppose that the drainage area is 4000 acres. What would be the initial gas-in-place at the given pressure, and what would be the residual gas if the pressure dropped to 3000 psi? What would be the difference in the production rate at the two instances described in Problem 4-4? Assume that pwf=1000 psi. Composition of gas and properties: C (0.875) i-C4 (0.006) n-C5 (0.008) Tpc www.am : 378R Well and Reservoir Variables T = 180F 640R Pi = 4613 psi Zi 0.945 0.0244 cp 78 ft Mi = h Sw Sg $ C (0.083) n-C4(0.002) n-C6(0.001) = rw Ppc = 671 psi = 0.27 = 0.73 Waldende C3(0.021) i-C5(0.003) C7+(0.001) k = 0.17 md Yg = 0.65 : 0.14 0.328 ft (7 7/8-in. well)