Composition of gas and properties: C (0.875) C2 (0.083) C3 (0.021) i-C4 (0.006) -4(0.002) i-C5 (0.003)...

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Composition of gas and properties: C (0.875) C2 (0.083) C3 (0.021) i-C4 (0.006) п-С4(0.002) i-C5 (0.003) п-Cs(0.008) п-Сo(0.001) C7+(0.001) Tpc = 378°R Ppe = 671 psi Yg = 0.65 Well and Reservoir Variables T = 180°F = 640°R Pi = 4613 psi Z; = 0.945 Hi = 0.0244 cp h = 78 ft = 0.27 0.73 $ = 0.14 rw = 0.328 ft (7 7/8-in. well) k = 0.17 md kh [m{p;) – m(Puf)] k q (MSCF/d) log t + log - 3.23 (4-60) 1638 T O (u ci); r Calculate a cumulative production curve for the gas well in Appendix C, assuming infinite-acting behavior [Eq. (4-60)] for 1 year. Bottomhole pressure is 2000 psi. What fraction of the original gas-in-place will be produced if A=4000 acres? How would the cumulative production obtained in Problem 4-9 compare with a calcu- lated value using the pseudo-steady-state relationship? (That is, assume that the well reached pseudo-steady state and that for the duration of the year the "average" pressure was equal to the initial reservoir pressure, p;=4613 psi). Comment on the results. Composition of gas and properties: C (0.875) C2 (0.083) C3 (0.021) i-C4 (0.006) п-С4(0.002) i-C5 (0.003) п-Cs(0.008) п-Сo(0.001) C7+(0.001) Tpc = 378°R Ppe = 671 psi Yg = 0.65 Well and Reservoir Variables T = 180°F = 640°R Pi = 4613 psi Z; = 0.945 Hi = 0.0244 cp h = 78 ft = 0.27 0.73 $ = 0.14 rw = 0.328 ft (7 7/8-in. well) k = 0.17 md kh [m{p;) – m(Puf)] k q (MSCF/d) log t + log - 3.23 (4-60) 1638 T O (u ci); r Calculate a cumulative production curve for the gas well in Appendix C, assuming infinite-acting behavior [Eq. (4-60)] for 1 year. Bottomhole pressure is 2000 psi. What fraction of the original gas-in-place will be produced if A=4000 acres? How would the cumulative production obtained in Problem 4-9 compare with a calcu- lated value using the pseudo-steady-state relationship? (That is, assume that the well reached pseudo-steady state and that for the duration of the year the "average" pressure was equal to the initial reservoir pressure, p;=4613 psi). Comment on the results.

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