PGE312_Spring_2010_Test_3_Solution_Key[1]

# PGE312_Spring_2010_Test_3_Solution_Key[1] - 1 PGE 312...

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1 PGE 312 – SPRING 2010 Physical and Chemical Behavior of Petroleum Fluids I Test #3, 50 Minutes Solution Key Problem 1 (30 points) Figure 1 shows an idealized saturated oil reservoir with a gas cap (free gas). Because the oil and the free gas in the gas cap are in phase equilibrium, the oil is at its bubble point and the gas cap gas is at its dew point. Therefore, the initial reservoir pressure of 4000 psia is the bubble point pressure of the oil and the dew point pressure of the gas cap gas at the reservoir temperature of 200 ˚F. Here are additional facts about this saturated oil reservoir. Area = 3950 acres P o r o s i t y = 2 8 % Initial water saturation = 15% Initial gas Z factor = 0.85 Stock tank oil API gravity = 40º API Initial oil formation volume factor = 1.45 reservoir barrels/STB Initial oil solution gas oil ratio = 850 scf/STB Initial oil viscosity 0.50 cp Oil Zone Gas Cap 550 ft 250 ft Figure 1. Idealized saturated oil reservoir. a. Calculate the initial gas in place in the gas cap in standard cubic feet (scf).

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2        10 12 3 43560 1 43560 3950 250 0.28 1 0.15 1.024 10 2.582 10 0.02827 3.965 10 0.02827 0.85 200 460 4000 wi gi Ah S HCPV G scf ZT B P      b. Calculate the initial oil in place in stock tank barrels (STB)   9 9 7758 1 7758 3950 550 0.28 1 0.15 4.011 10 2.766 10 1.45 1.45 wi oi oi Ah S HCPV N STB BB c. Calculate the stock tank oil density in lb mass/cu ft. 141.5 141.5 0.8251 131.5 40 131.5 o API  lb mass/cu ft 0.8251 62.4 51.48 o d. Sketch a diagram to show how the oil formation volume factor will vary with reservoir pressure as the reservoir is depleted from the initial reservoir pressure of 4000 psia down to 14.7 psia at the fixed reservoir temperature of 200º F. Mark on
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PGE312_Spring_2010_Test_3_Solution_Key[1] - 1 PGE 312...

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