This app calculates the gas compressibility factor Z with five differents correlation with:
- Papay
- Dranchuk-Purvis-Robinson
- Hall-Yarborough
- Bill-Beggs
- Dranchuk-Abou Kassem
Using three parameters: pressure, temperature and gas specific gravity it calculate the pseudocritical properties with the Standing correlations that expressed mathematicaly the graphical correlation of Brown et al.
Now you can do the calculate using only Pseudoreduced parameters, also you can consult the Standing-Katz Z-factor chart