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The following data are taken from a study on a recombined sample of separator gas and separator condensate in a PVT cell with an

 

The following data are taken from a study on a recombined sample of separator gas and separator condensate in a PVT cell with an initial hydrocarbon volume of 3958.14 cms. The wet gas gal/MSCF (GPM) and the residue gas-oil ratios were calculated using equilibrium ratios for production through a separator operating at 300 psia and 70F. The initial reservoir pressure was 4000 psia, which was also close to the dew-point pressure, and reservoir temperature was 186F. (a) On the basis of an initial reservoir content of 1.00 MM SCF of wet gas, calculate the wet gas, residue gas, and condensate recovery by pressure depletion for each pressure interval. (b) Calculate the dry gas and condensate initially in place in 1.00 MM SCF of wet gas. (c) Calculate the cumulative recovery and the percentage of recovery of wet gas, residue gas, and condensate by depletion performance at each pressure. (d) Calculate the recoveries at an abandonment pressure of 605 psia on an acre-foot basis for a porosity of 10% and a connate water of 20%. Composition in mole percentages Pressure 4000 3500 2900 2100 1300 605 (psia) CO, 0.18 0.18 0.18 0.18 0.19 0.21 0.13 0.13 0.14 0.15 0.15 0.14 67.72 63.10 65.21 69.79 70.77 66.59 C, 14.10 14.27 14.10 14.12 14.63 16.06 8.37 8.25 8.10 7.57 7.73 9.11 iC nC, 0.98 0.91 0.95 0.81 0.79 1.01 3.45 3.40 3.16 2.71 2.59 3.31 iC, nC 0.91 0.86 0.84 0.67 0.55 0.68 1.52 1.40 1.39 0.97 0,81 1.02 1.79 1.60 1.52 1.03 0.73 0.80 C,, 6.85 5.90 2.00 1.07 4.41 1.06 Molecular 143 138 128 116 111 110 weight C,, Gas 0.867 0.799 0.748 0.762 0.819 0.902 deviation factor for wet gas at 186F Wet gas production (cm') at cell Pand T 224.0 474.0 1303 2600 5198 Wet gas GPM 5.254 4.578 3.347 1.553 0.835 0.895 (calculated) Residue 7127 8283 11,621 26,051 49,312 45,872 gas-oil ratio 22.46 18.07 Retrograde liquid, 3.32 19.36 23.91 percentage of cell volume

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