Fall08_Test3_Key - 1 PGE 312 - FALL 2008 Physical and...

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1 PGE 312 - FALL 2008 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 = 3900 acres Porosity = 25% Initial water saturation = 15% Initial gas Z factor = 0.85 Stock tank oil API gravity = 35º API Initial oil formation volume factor = 1.25 reservoir barrels/STB Initial oil solution gas oil ratio = 800 scf/STB Initial oil viscosity 0.56 cp Figure 1. Idealized saturated oil reservoir. Gas Cap Oil Zone 150 ft 450 ft
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2 a. Calculate the initial gas in place in the gas cap in standard cubic feet (scf). ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 9 12 3 43560 1 43560 3900 150 0.25 1 0.15 5.415 10 1.366 10 0.02827 3.965 10 0.02827 0.85 200 460 4000 wi gi Ah S HCPV x G x scf ZT B x P φ - - - = = = = = + b. Calculate the initial oil in place in stock tank barrels (STB) ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 9 9 7758 1 7758 3900 450 0.25 1 0.15 2.893 10 2.315 10 1.25 1.25 wi oi oi Ah S HCPV x N x STB B B - - = = = = = c. Calculate the stock tank oil density in lb mass/cu ft. 141.5 141.5 0.8498 131.5 35 131.5 o API γ = = = + + o ( 29 ( 29 0.8498 62.4 53.03 o ρ = = lb mass/cu ft 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
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Fall08_Test3_Key - 1 PGE 312 - FALL 2008 Physical and...

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