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# Petroleum Reservoir Fluid Properties and Thermodynamics watch

1. Hi Guys, question here from a Petroleum Engineering assignment! Please answer what you can as I'm really struggling with this one!!

1)
A) Estimate the isothermal compressibility of a dry gas for use at 4,200 psia using the
following data taken at 120 oF.

B) Some of this gas is placed in a piston cylinder and pressurized to 6000 psia at 120
oF. The volume occupied by gas becomes 500 cc. Calculate the number of poundmoles
of gas in the cylinder.

C) The cylinder pressure is isothermally reduced to 2800 psia by displacing the piston.
What would be the new volume occupied by gas at this pressure?

Pressure z factor
6000 1.1252
5600 1.0736
5200 1.0222
4800 0.9711
4400 0.9207
4000 0.8715
3600 0.8243
3200 0.7952
2800 0.7824
2600 0.781

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