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HW_10_Solution

# HW_10_Solution - PGE 312 SPRING 2006 Physical and Chemical...

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PGE 312 SPRING 2006 Physical and Chemical Behavior of Petroleum Fluids I Solution to Homework 10 Problem 9-1 After plotting the given data and drawing the best fit lines through the pressure and gas oil ratio data, we get the following figure: Production History 0 100 200 300 400 500 600 700 800 900 1000 0.01 0.10 0.23 0.47 0.66 0.96 1.10 1.35 1.56 1.80 2.00 Cummulative Oil Production, MM STB Producing Gas Oil Ratio, scf/STB 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 Reservoir Pressure, psia Gas Oil Ratio Pressure From the above figure, the bubble point pressure is 2,000 psia and the gas oil ratio is 520 scf/STB at the bubble point. From Figure 9-3, the correction for stock tank vent gas is 80 scf/STB. So, R sb = 520 + 80 = 600 scf/STB. % 692 . 3 100 623 623 600 R in Error % 734 . 3 100 1928 2000 1928 P in Error s b = × - = = × - = Problem 11-2 From Figure 11-1 P b 2070 psia for the given data.

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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 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
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