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Excel Function To Calculate Gas Compressibility

Input Gas Parameter:Gas Gravity (Air=1.0) 0.7Mole Percent CO2 0Mole Percent H2S 0Bottomhole Temperature, Deg F 300

Intermediate Calculation:Bottomhole Temperature, Rankine 759Pseudocritical Temperature, Tpc #VALUE!Pseudocritical Pressure, Ppc #VALUE!Reduced Temperature, Tr #VALUE!Reduced Pressure, Pr see table below

Results: Validation:P (psia) Pr Z Factor Z Factor

14.7 #VALUE! #VALUE! 0.99920434.8 #VALUE! #VALUE! 0.97802869.6 #VALUE! #VALUE! 0.96040

1304.3 #VALUE! #VALUE! 0.947881739.1 #VALUE! #VALUE! 0.940932173.9 #VALUE! #VALUE! 0.939722608.7 #VALUE! #VALUE! 0.944053043.5 #VALUE! #VALUE! 0.953413478.3 #VALUE! #VALUE! 0.967183913.0 #VALUE! #VALUE! 0.984674347.8 #VALUE! #VALUE! 1.005224782.6 #VALUE! #VALUE! 1.028295217.4 #VALUE! #VALUE! 1.053405652.2 #VALUE! #VALUE! 1.080166087.0 #VALUE! #VALUE! 1.108266521.7 #VALUE! #VALUE! 1.137456956.5 #VALUE! #VALUE! 1.167537391.3 #VALUE! #VALUE! 1.198327826.1 #VALUE! #VALUE! 1.229708260.9 #VALUE! #VALUE! 1.261568695.7 #VALUE! #VALUE! 1.293799130.4 #VALUE! #VALUE! 1.326349565.2 #VALUE! #VALUE! 1.35913

10000.0 #VALUE! #VALUE! 1.39211

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0 2000 4000 6000 8000 10000 120000.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

Z FactorValidation:

Pressure (psia)

Z F

ac

tor

0 2000 4000 6000 8000 10000 120000.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

Z FactorValidation:

Pressure (psia)

Z F

ac

tor