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HOMEWORK 5 1. The following information is available from a gas reservoir: P. 2000 psia 78 0.69 T -100°F ==18ft. 3=8.7% S 25% k 87.5 md 0 D=7.76x10"3 MCFD A 3920 acres Nwells Current Presure = 1660 psia A. Determine the initial gas in place and the cumulative gas production. B. Determine how long this reservoir can sustain a rate of 10 MMCD against well pressure of 400 psia. C. Repeat part B, assuming that the rate is 12 MMCFD. D. Repeat part B, assuming that the well pressure is 200 psia. E. Repeat part C, assuming that that the well pressure is 200 psia. Number range CHAPTER 2. The following information is available from a wet gas reservoir: T = 100°F P 2527 psia A 1780 acres h 13ft. ç0 8.5% Swr = 26% Separator Gas Rate 4325 MCF/D Separator Gas Gravity 0.63 Stock-Tank Gas Rate 650 MCF/D Stock-Tank Gas Gravity 1.00 Stock-Tank Oil Rate 35 STB/D Stock-Tank Oil Gravity = 47° API The reservoir is completely surrounded by an aquifer with the following properties: k 100 md h 15ft. 4 10% Hw=1cp g=7x10°1/psi Calculate the reservoir pressure after producing at a constant separator gas rate of 4325 MCF/D for one year. You can ignore the water production. 3. PVT, relative permeability, and other data for a solution gas drive oil reservoir are were provided below. Determine: A) The cumulative oil and gas production when the reservoir pressure reaches 300 psia. B) The time it takes to reach the reservoir pressure of 500 psia. There are 10 wells in the reservoir. P. 1700 psia h 13.4ft. 15.7% Sm = 25% k 30 md s=0 A 3640 acres Allowable Flow Rate = 300 STB/D (per well) Max. Safe Drawdown 400 psi Min. Flowing Pressure = 100 psi (with a pump) P Bo Rs Wo Ka psia RB/STB RB/STB SCF/STB cp cp 1700 1.265 1.32 540 1.19 0.0200 1500 1.241 1.50 490 1.22 0.0203 1300 1.214 1.75 440 1.25 0.0205 1100 1.191 2.10 387 1.30 0.0207 900 1.161 2.62 334 1.35 0.0209 700 1.147 3.44 278 1.50 0.0214 500 1.117 4.95 220 1.80 0.0245 300 1.093 8.60 160 2.28 0.0265 S2 krg kro 1.00 0.000 1.00 0.95 0.0053 0.840 0.90 0.0138 0.701 0.85 0.0356 0.586 0.80 0.0920 0.491 0.75 0.2390 0.411 0.68 0.9040 0.320 0.60 4.1370 0.241 Allowable Flow Rate - 300 STB/D (per well) Mox. Safe Drawdown= 400 psi Min. Flowing Pressure = 100 psit (with a pump)

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