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Test3Fall07

# Test3Fall07 - 1 PGE 312 FALL 2007 Physical and Chemical...

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1 PGE 312 - FALL 2007 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. 1. ( 20 points ) Your company has discovered a dry gas reservoir with the following characteristics: Reservoir area = 2 miles x 1 mile Reservoir thickness = 250 ft Initial reservoir pressure = 5000 psia Reservoir temperature = 200 ° F Average porosity = 15% Average water saturation = 20% Initial gas Z-factor = 1.01 Calculate the initial gas in place in standard cubic feet. Note: 1 mile = 5280 feet

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2 2. ( 15 points ) Figure 1 shows the production performance of a dry gas reservoir with no water influx. a. Determine the initial gas in place in standard cubic feet (scf). b. Predict the gas recovery factor in % if the gas field will be abandoned at a P/ Z of 2000 psia. P/Z vs Gp Plot 0 1000 2000 3000 4000 5000 6000 7000 8000 0.0E+00 2.0E+08 4.0E+08 6.0E+08 8.0E+08 1.0E+09 1.2E+09 Cumulative Gas Production (scf) P/Z (psia) Figure 1. Dry gas reservoir performance.
3 3. ( 25 points

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Test3Fall07 - 1 PGE 312 FALL 2007 Physical and Chemical...

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