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HWK 4 solution

# HWK 4 solution - MScf/Bbl This occurs because the average...

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PGE 362 Production Engineering HWK 4 This homework is due at lecture time on Friday, Oct. 5, 2007. (1) Use the Beggs & Brill correlation in the two phase flow module of the PPS software to show the effect of increasing gas-oil ratio on flowing bottom hole pressure. Please plot on one graph the flowing pressure traverse for the following well using gas-oil ratios of 0, 500, 1000, 2000, 3000 Scf/Bbl. Diameter = 2.441” Length = 10,000’ Length increment = 200’ Surface temperature = 100 deg F Bottom hole temperature = 150 deg F Wellhead pressure = 125 psi Pipe roughness = 0.0006 Inclination angle = 90 degrees Oil flow rate = 1000 bbl/day Water-oil ratio = 0 Oil gravity = 35 deg API Gas gravity = 0.7 Pressure Traverse 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 0 1000 2000 3000 4000 Pressure (psi) Depth (ft) 0 Scf/Bbl 500 Scf/Bbl 1000 Scf/Bbl 2000 Scf/Bbl 3000 Scf/Bbl

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The bottom hole pressure required to flow decreases as the gas increases up to 2000
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Unformatted text preview: MScf/Bbl. This occurs because the average density of the mixture decreases with the addition of more gas. However, above 2000 MScf/Bbl the amount of gas added begins to increase the friction pressure, offsetting the benefit of density reduction. (2) Use the PPS single phase gas flow model to create a vertical lift performance plot for the follow well using flow rates of 10, 20, 40, and 60 MMScf/Day of gas for tubing internal diameters of 2”, 2.5”, and 3”. Bottom hole temperature = 200 deg F Surface temperature = 150 deg F Flowing surface pressure = 125 psi Length = 10,000’ Inclination angle = 90 degrees Pipe roughness = 0.0006 Gas gravity = 0.71 Vertical Lift Performance 5000 10000 15000 20000 10 20 30 40 50 60 Gas Flow Rate (MMScf/Day) Pwf (psi) 2" 2.5" 3"...
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