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HW_9_Solution - PGE 312 Physical and Chemical Behavior of...

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PGE 312 – Physical and Chemical Behavior of Petroleum Fluids I Homework 9, Spring 2008 Problem 9-1 The given data is plotted and then a line of best fit is drawn through the pressure and GOR data. This is shown in the figure below: From the figure, Bubble Point Pressure = 2,000psia GOR = 520 scf/stb From Fig. 9-3, the correction for stock tank vent gas is 80scf/stb Therefore, R sb = 520 + 80 = 600 scf/stb Therefore, calculating the errors in P b and R s , b s 1928 2000 Error in P 100 3.734% 2000 600-623 Error in R = 100 3.692% 623 = × = × = Problem 11-2 Using the given information, From Fig. 11-1, P b = 2,070 psia
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Problem 11-4 The following table is generated from Figure 11-1 by using the provided data. Reservoir Pressure, psia Gas Oil Ratio, scf 1914.7 530 1764.7 490 1614.7 435 1464.7 390 1314.7 345 1164.7 295 1014.7 250 864.7 220 714.7 175 564.7 130 414.7 90 264.7 No reading at 250 o C Problem 11-7 Trial Pseudo-liquid density = 43.8 lbm/cu ft Apparent Methane liquid density = 20 lbm/cu ft Apparent Ethane liquid density = 29.4 lbm/cu ft Component Mole Fraction Molecular Weight Mass, lb Liquid Density at Standard Conditions, lb/ft 3 Liquid Volume, ft 3 M j x j M j ρ oj x j M j/ ρ oj Methane 0.4642 16.04 7.45 20 0.37 Ethane 0.0637 30.07 1.92 29.4 0.07 Propane 0.0561 44.1 2.47 31.64 0.08 i-Butane 0.0119 58.12 0.69 35.11 0.02 n-Butane 0.0383 58.12 2.23 36.42 0.06 i-Pentane 0.0168 72.15 1.21 38.96 0.03 n-Pentane 0.0195 72.15 1.41 39.36 0.04 Hexanes 0.0285 86.18 2.46 41.4 0.06 Heptanes plus 0.3010 202 60.8 53.04 1.15 1.000 80.64 1.88 Pseudo-liquid density 43.2 lbm/cu ft
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Second Trial Pseudo-liquid density = 31.2 lbm/cu ft Apparent Methane liquid density = 14.4 lbm/cu ft Apparent Ethane liquid density = 25.7 lbm/cu ft Component Mole Fraction Molecular Weight Mass, lb Liquid Density at Standard Conditions, lb/ft 3 Liquid Volume, ft 3 M j x j M j ρ oj x j M j/ ρ oj Methane 0.4642 16.04 7.45 14.4 0.52 Ethane 0.0637 30.07 1.92 25.7 0.07 Propane 0.0561 44.1 2.47 31.64 0.08 i-Butane 0.0119 58.12 0.69 35.11 0.02 n-Butane 0.0383 58.12 2.23
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