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2
1
0
-1
-2
-3
-4
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
1 x 10 4
0
2000
4000
6000
8000
Pressure, psia
Piper et al.
Sutton (2007) with Wichert-Aziz
Elsharkawy-Elkamel
Standing with Wichert-Aziz
Fig. 2-3. Comparisons of relative errors in gas z-factor correlations using data of table 2-1 split by
pressure. All calculations used Dranchuk-Abou-Kassem z-factor equations.
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