Water formation volume factor

A2.1 Formation Volume Factor#

McCain

The McCain (1990) correlation is a classical method for calculating the formation water volume factor. The method accounts for the effects of pressure, temperature, salinity (TDS), and dissolved gas, offering a physically grounded model with high accuracy. A key feature is the separate treatment of water compressibility and thermal expansion. For formation waters with TDS > 50,000 ppm, a salinity correction is required. 
Recommended applicability range:

• Temperature: 100 – 400 °F
• Salinity (TDS): 0 – 200,000 ppm
• Gas content: 0 – 50 SCF/STB
• Pressure: 14.7 – 10,000 psi