PtE_412_HW_Set_4_Spring_2007

PtE_412_HW_Set_4_Spring_2007 - use the material balance...

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PtE 412/464 HW Set 4 Due 2/7/07 1. The production data for a gas field are given below. Assume volumetric behavior and a reservoir temperature of 250F. (5 points) P/z Gp (psia) (B scf) 6553 0.393 6468 1.642 6393 3.226 6329 4.260 6246 5.504 6136 7.538 6080 8.749 (a) What is the original gas in place? (b) What would be the percentage of original gas in place recovered at a P/z of 2000 psia? 2. For the following gas reservoir, estimate the original gas in place and formation compressibility using the material balance method for geopressured reservoirs. In addition,
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Unformatted text preview: use the material balance method for a normally-pressured reservoir and compare initial gas in place estimates by both methods. Water compressibility, c w , 1/psi = 3.2 x 10-6 S wi , frac = 0.22 Pressure P/z Gp (psia) (psia) (MMSCF) 11,444 7,650 0 10,674 7,423 9,920 10,131 7,252 28,620 9,253 6,957 53,600 8,574 6,698 77,670 7,906 6,428 101,420 7,380 6,191 120,360 6,847 5,933 145,010 6,388 5,693 160,630 5,827 5,375 182,340 5,409 5,132 197,730 5,000 4,840 215,660 4,500 4,478 235,740 4,170 4,221 245,900...
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