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Reservoir Exam2Key(2005)

# Reservoir Exam2Key(2005) - PGE331 Exam 2 Key Open book...

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PGE331 Exam 2 Key Open book, notes. Show all work and read each problem carefully. 1. Material Balance Response . Ignore the connate water expansion and hydrocarbon pore volume expansion in this problem. The initial hydrocarbon is an undersaturated oil. a. (15 points) The figure below shows the cumulative underground withdrawal F plotted against the oil expansion factor E o . 0 2 4 6 0.00 0.05 0.10 0.15 E o (rb/STB) What do you think the drive mechanism is? Why do you say this? What is the original hydrocarbon (both gas and oil) in place? The straight line indicates that the drive mechanism is some sort of expansion drive, probably solution gas drive. Can't say more than this with the information given. The original oil in place is the slope of the line Ν = 4.5 ΜΜρβ 0.15 ρβ ΣΤΒ = 30 ΜΜ ΣΤΒ Can't say what the original gas in place is because the solution gas-oil ratio is not given. Taking a typical value from Table 1-3 Γ = 30 ΜΜ ΣΤΒ ( 29 500 σχφ ΣΤΒ = 15000 ΜΜ σχφ= 15 βχφ Grading: Drive mechanism 5 HCs in place 10 The following problems are sketches (no calculation required). The figure is for reservoir A and you are to supply the points or curve for reservoir B. Reservoir B is identical to reservoir A in every respect except for the item noted. 1

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b. (10 points) Reservoir B has a substantial water drive. 0 2 4 6 0.00 0.05 0.10 0.15 E o (rb/STB) The curve will no longer be a straight line because the water influx will support the pressure and thereby cause the expansion factor to be less at a given F than in reservoir A. c. (10 points) Reservoir B has one-half the original hydrocarbon in place. 0 2 4 6 0.00 0.05 0.10 0.15 E o (rb/STB) Reservoir B is exactly the same as reservoir A with one-half the slope.
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