Spring09_HW9 evens - PGE 312 Physical and Chemical Behavior...

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Unformatted text preview: PGE 312 Physical and Chemical Behavior of Petroleum Fluids I Homework 9 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: PRODUCTION HISTORY 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 GOR (scf/stb) 1,000 2,000 3,000 4,000 5,000 6,000 7,000 Reservoir Pressure (psia) Gas Oil Ratio Pressure 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 = 2070 psia 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 1314.7 340 1164.7 290 1014.7 250 864.7 220 714.7 175 564.7 130 414.7 90 264.7 No reading Problem 11-7 cuft lbm Apparent cuft lbm Apparent cuft lbm Trial liquid ethane liquid methane liquid / 4 . 29 ) ( / 20 ) ( / 8 . 43 ) ( _ _ = = = Component Mole Fraction Molecular Weight Mass (lb) Liquid Density at Standard Conditions (lb/ft 3 ) Liquid Volume, (ft 3 ) x j M j x j M j oj x j M j / 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 0.64 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 + 0.301 202 60.8 53.04 1.15 1.000 80.64 1.88 3 / 9 . 42 ft lbm Volume mass liquid liquid liquid = = Trial 2: cuft lbm Apparent cuft lbm Apparent cuft lbm Trial liquid ethane liquid methane liquid / 7 . 25 ) ( / 4 . 14 ) ( / 2 . 31 ) ( _ _ = = = Component Mole Fraction Molecular Weight Mass (lb) Liquid Density at Standard Conditions (lb/ft 3 ) Liquid Volume, (ft 3 ) x j M j x j M j oj x j M j / oj Methane 0.4642 16.04 7.45 14.4 0.52 Ethane 0.0637 30.07 1.92 25.7 0.07 Propane...
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Spring09_HW9 evens - PGE 312 Physical and Chemical Behavior...

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