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