The R Sand is a volumetric oil reservoir whose PVT properties are shown in Fig. 5.9....
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The R Sand is a volumetric oil reservoir whose PVT properties are shown in Fig. 5.9. When the reservoir pressure dropped from an initial pressure of 2500 psia to an average pressure of 1600 psia, a total of 26.0 MM STB of oil had been produced. The cumulative GOR at 1600 psia was 954 SCF/STB, and the current GOR was 2250 SCF/STB. The average porosity for the field is 18% and average connate water 18%. No appreciable amount of water was produced, and standard conditions were 14.7 psia and 60°F. a) Calculate the initial oil in place. b) Calculate the SCF of evolved gas remaining in the reservoir at 1600 psia. c) Calculate the average gas saturation in the reservoir at 1600 psia. d) Calculate the barrels of oil that would have been recovered at 1600 psia if all theproduced gas had been returned to the reservoir. e) Calculate the two-phase volume factor at 1600 psia. f) Assuming no free gas flow, calculate the recovery expected by depletion driveperformance down to 2000 psia. g) Calculate the initial SCF of free gas in the reservoir at 2500 psia. 1.30 1.28 1.26 575 0.87 % 550 1.24 FVF 0.86 2 525 SOLUTION GÓR GAS DEVIATION FACTOR 0.85 , 500 01.22 0.84 É 47 0.83 450 21.20 0.82 425 0.81 3 400 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 1500 375 PRESSURE, PSIA 350 Fig. 5.9. PVT data for the R Sand Reservoir at 150°F. FORMATION VOLUME FACTOR, BBL/STB SOLUTION GOR, SCF/STB The R Sand is a volumetric oil reservoir whose PVT properties are shown in Fig. 5.9. When the reservoir pressure dropped from an initial pressure of 2500 psia to an average pressure of 1600 psia, a total of 26.0 MM STB of oil had been produced. The cumulative GOR at 1600 psia was 954 SCF/STB, and the current GOR was 2250 SCF/STB. The average porosity for the field is 18% and average connate water 18%. No appreciable amount of water was produced, and standard conditions were 14.7 psia and 60°F. a) Calculate the initial oil in place. b) Calculate the SCF of evolved gas remaining in the reservoir at 1600 psia. c) Calculate the average gas saturation in the reservoir at 1600 psia. d) Calculate the barrels of oil that would have been recovered at 1600 psia if all theproduced gas had been returned to the reservoir. e) Calculate the two-phase volume factor at 1600 psia. f) Assuming no free gas flow, calculate the recovery expected by depletion driveperformance down to 2000 psia. g) Calculate the initial SCF of free gas in the reservoir at 2500 psia. 1.30 1.28 1.26 575 0.87 % 550 1.24 FVF 0.86 2 525 SOLUTION GÓR GAS DEVIATION FACTOR 0.85 , 500 01.22 0.84 É 47 0.83 450 21.20 0.82 425 0.81 3 400 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 1500 375 PRESSURE, PSIA 350 Fig. 5.9. PVT data for the R Sand Reservoir at 150°F. FORMATION VOLUME FACTOR, BBL/STB SOLUTION GOR, SCF/STB
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Pressure p 2500 psi p1 1600 psi NP 26 10 Rp 1500 954 scf GOR2250 scf STB 18 a RF BtBti NB... View the full answer
Related Book For
Thermodynamics An Engineering Approach
ISBN: 978-0073398174
8th edition
Authors: Yunus A. Cengel, Michael A. Boles
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