PNGE 332 spring 2019 Due April 9th 6:00 p.m HOMEWORK #6 (You should use EXCEL and show your work completely for full credit) 1. You have Your recently completed well is producing 38°API oil and 0.70 specific gravity gas at 1100 scf/STB. Producing gas-oil ratio has remained constant, so you believe reservoir pressure is above the bubble-point pressure of the reservoir oil. Estimate bubble-point pressure given that reservoir temperature is 250°F. 2. The solubility of the following gas in a 39. 0°API stock-tank oil is 589 scf/STB at 1763 psia and 250°F. Calculate the density of the reservoir liquid at 1763 psia and 250°F. Component Hydrogen sulfide Carbon Dioxide Nitrogen Methane Ethane Propane i-Butane n-Butane i-Pentane n-Pentane Hexane Heptane plus Composition Mole percent 20.90 14.69 1.22 17.15 5.12 1.01 0.90 1.12 1.23 3.33 0.23 33.10 100 3. Calculate the formation volume factor of the oil described in problem 2 at its bubble point of 1763 psia and 250°F. 4. The producing gas-oil ratio of a well is 1200 scf/STB, and the specific gravities of the gas and stock-tank oil are 0.62 and 38.3°API, respectively. The liquid in the reservoir is at its bubble point at reservoir conditions of 3385 psia and 205°F. Calculate the density of this liquid at reservoir conditions. 5. An oil has Bob = 1.255 res bbl/STB, Rsb = 410 scf/STB for Pb = 2265 psig at 214°F. Produced gas specific gravity is 0.811 and stock-tank oil gravity is 25.2°API. Estimate Bo at Pi = 4070 psig. Use co = 8E-6 psi-1. 6. A black oil has a bubble-point pressure of 1250 psia at reservoir temperature of 150°F. Producing gas-oil ratio is 500 scf/STB of 0.872 specific gravity gas and 30.2°API stocktank oil. Estimate a value of viscosity at initial reservoir pressure of 2880 psia. 7. The compositions of the equilibrium gas and liquid of a black oil at reservoir conditions of 1500 psia and 150°F are given below. Calculate the liquid-gas interfacial tension. Specific gravity of Heptane plus is 0.85 and its molecular weight is 202 lb/lb mole. Component Liquid Mole Fraction Gas Mole Fraction Methane Propane Ethane n-Butane i-Butane n-Pentane i-Pentane Hexane Heptane plus 0.3105 0.0646 0.0638 0.0478 0.0146 0.0255 0.0218 0.0382 0.4132 0.8742 0.0335 0.0634 0.0129 0.0049 0.0034 0.0035 0.0026 0.0016
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