PROBLEM 3.12 A gas-producing formation has uniform thickness of 32 ft, a porosity of 19%, and connate water saturation of 26%. The gas deviation factor is 0.83 at the initial reservoir pressure of 4450 psia and reservoir temperature of 175°F. (a) Calculate the initial in-place gas per acre-foot of bulk reservoir rock. (b) How many years will it take a well to deplete by 50% a 640 ac unit at the rate of 3 MM SCF/day? (c) If the reservoir is under an active water drive so that the decline in reservoir pressure is negligible, and during the production of 50.4 MMM SCF of gas water invades 1280 acres, what is the percentage of recovery by water drive? (d) What is the gas saturation as a percentage of total pore space in the portion of the reservoir invaded by water?
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Calculate the initial in-place gas per acre-foot of bulk reservoir rock. Initial gas per acre-foot = (0.83*640*(4450-p))/((1400*(175-p))) = 5.82 MMscf/acre-foot. Show more…
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3.5 A gas well is completed at a depth of 8550 feet. The log analysis showed a total formation thickness of 12 feet with 16% porosity and 30% water saturation. During the potential test, the well produced dry gas with a specific gravity of 0.75. The reservoir pressure was determined from a drill stem test (DST) to be 3850 psi, and the log heading showed a reservoir temperature of 155°F. The gas will be produced at the surface where the standard pressure is 14.65 psi and the standard temperature is 60°F. The study includes the analysis of offset wells. 3.3 An oil well has been drilled and completed. The productive zone has been encountered at a depth of 7815–7830 feet. The log analysis showed an average porosity of 15% and an average water saturation of 35%. The oil formation volume factor was determined from empirical equations to be 1.215 RB/Stb. Experience shows that other reservoirs with similar properties drained 80 acres with a recovery factor of 12%. Compute the STOIIP and the ultimate recovery.
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