Exam3_Key_2007

Exam3_Key_2007 - PETE 2032 Third Hour Exam 5/1/2007 Name_...

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PETE 2032 Name______________________________________ Third Hour Exam Last Four Digits Student ID____________________ 5/1/2007 1 All work must be shown. All writing must be legible, if I can’t read it, it is wrong. All work must be contained on the pages of the exam and the attached calculation sheets. No open books, no additional notes (except the 3”x5” card); keep your eyes on your own papers. Write your name on the exam, use the last four digits of your student number and sign each page . “Always do right. This will gratify some people and astonish the rest. “ Mark Twain (1835 - 1910) US humorist, novelist, short story author, & wit
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PETE 2032 Name______________________________________ Third Hour Exam Last Four Digits Student ID____________________ 5/1/2007 2 1. (15%)Your company has made a recent acquisition of a producing well. The main reservoir in the well has a reservoir temperature of 160 o F, tank oil gravity of 38 o API and a producing gas-oil-ratio of 1500 scf/STB. The apparent Molecular Weight of the gas is 23.2 and the reservoir pressure is 3000 psia. a. Is the oil in the reservoir saturated? If so, explain why; if not explain why. 8 . 0 29 2 . 23 = = g γ Using 1500 scf/STB on chart on Page 13, P b = 4200 psi Oil must be saturated since reservoir pressure is 3000 psi. If solution GOR were 1500 scf/STB, the oil would be saturated at the bubble point and the reservoir pressure would be 4200 psi. Or Since R s = 880 scf/STB for a saturated oil at 3000 psia, a GOR greater than this indicates free gas in the reservoir, therefore saturated (GOR is 1500 scf/STB) b. When the reservoir pressure drops to 2000 psia, what would you estimate the solution gas-oil- ratio (R s ) to be? From chart on Page 12, R s = 650 scf/STB c. At the reservoir conditions in 1 (b), what would be the total formation volume factor (B t )? From chart on Page 14, B t = 2 RVB/STB
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PETE 2032 Name______________________________________ Third Hour Exam Last Four Digits Student ID____________________ 5/1/2007 3 2. (15%)Circle the correct answers for an ideal solution.
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Exam3_Key_2007 - PETE 2032 Third Hour Exam 5/1/2007 Name_...

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