Standing Katz Chart

Behaviour of Gases

Compressibility Factors for Natural Gases as a Function of Pseudoreduced Pressure and Temperature.

1.1

0

Pseudo Reduced Pressure, Pr

1

2

3

4

5

6

8

Pseudo Reduced Temperature 3.0 2.8 2.6 2.4 2.2 2.0 1.9 1.8

1.0

0.9

5

1. 4

1.0 1.05 1.2 0.95

1.

1.5

05

1.6

1.

1.7

1

0.8

1.3 1.1

1.1

1.

1.7

1.45

0.7

0.6

1. 3

1.2

1.6 1.8

1.15

0.4

2.0

3.0

2.8

1.1

1.3

2.6

1.2

3.0

2.2 2.0 1.8 1.7 1.6

0.9 7

1.9

1.1

Compressibility of Natural Gases (Jan. 1, 1941)

2.6 2.4 1.2

1.0

1.1 1.4 1.3

8

1.4

2.2

1.05

0.25

1.0

1.7 1.9

2.4

1.1

0.3

1.5

4 1. 1.5

1.25

0.5

1.6

2

1.4 1.35 1.3

1.

Compressibility Factor, z

7

1.05

0.9 9

10

11

12

13

Pseudo Reduced Pressure, Pr

14

15

Figure 2 Compressibility factors for natural gas1 (Standing & Katz, Trans AIME, 1942)

Institute of Petroleum Engineering, Heriot-Watt University

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