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# HW_7 - PGE 312 Physical and Chemical Behavior of Petroleum...

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PGE 312 – Physical and Chemical Behavior of Petroleum Fluids I Homework 7, Spring 2008 Problem 8-2 141.5 141.5 131.5 131.5 30.2 0.875 o o API γ =−=−= Problem 8-4 141.5 131.5 35.2 141.5 141.5 0.8488 131.5 35.2 131.5 o o o o API API =−= == = ++ Problem 8-7 Volume of Oil + dissolved gas leaving reservoir at Reservoir Conditions Volume of Oil in Stock Tank at Standard Conditions 227.0 1.356 167.4 o B res cc resbbl ST cc STB = To calculate B o To calculate R s Volume of Gas Produced at surface at Standard Conditions 6 Volume of Oil entering Stock Tank at Standard Conditions 0.537 0.059 566.1 167.4 6.2898 10 / s R scf scf scf ST cc bbl cc STB = + ×× To calculate B o To calculate R s Problem 8-9 86.3 / 1.49 / 57.9 / o o B resbbl d Br e s b b l S T B STB d =

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Volume of Gas Produced at surface at Standard Conditions Volume of Oil entering Stock Tank at Standard Conditions (43150 7240) 870.3 / 57.9 s s R scf R scf STB STB = + == As reservoir pressure is decreased from initial pressure to bubble-point pressure, B o is increased but R s is constant. Therefore, R s applies at the bubble point.
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HW_7 - PGE 312 Physical and Chemical Behavior of Petroleum...

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