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Institute of Petroleum Engineering, Heriot-Watt University 11
0
1.0
1.1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.251.1
1.0
0.9
1.01.05
1.05
1.11.2
1.3
1.4
1.5
1.6 1.7
1.8 1.9
2.0 2.2
2.4
2.63.0
3.02.8
1.21.3
1.1
1.10.95
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
1 2 3 4 5 6 7 8
7 8 9 10 11 12 13 14 15
Compressibility of Natural Gases(Jan. 1, 1941)
Compressibility Factors for Natural Gases as aFunction of Pseudoreduced Pressure and Temperature.
Com
pres
sibi
lity
Fact
or, z
Pseudo Reduced Temperature
Pseudo Reduced Pressure, Pr
3.02.82.62.42.22.01.91.81.71.6
1.51.45
1.351.4
1.3
1.25
1.2
1.15
1.1
2.6 2.42.22.0 1.9
1.71.6 1.4
1.3
1.21.1
1.05
1.051.8
1.4
1.5
Pseudo Reduced Pressure, Pr
Figure 2 Compressibilityfactorsfornaturalgas1(Standing&Katz,TransAIME,1942)
Behaviour of Gases