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Unformatted text preview: 1 PGE 312 - FALL 2008 Physical and Chemical Behavior of Petroleum Fluids I Test #3, 50 Minutes Closed Book Note: It will be in your best interest to attempt all the questions. Please budget your time accordingly. 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 = 35 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 Oil Zone Gas Cap 450 ft 150 ft Figure 1. Idealized saturated oil reservoir. 2 a. Calculate the initial gas in place in the gas cap in standard cubic feet (scf). b. Calculate the initial oil in place in stock tank barrels (STB) c. Calculate the stock tank oil density in lb mass/cu ft. Calculate the stock tank oil density in lb mass/cu ft....
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- Spring '08