Two separate correlations for predicting the isothermal compressibility of reservoir fluids and crude oils have been developed. One correlation is based on molecular weight; the other, on API gravity.

Compressibility Factor: A dimensionless quantity that indicates the deviation of a real gas from ideal gas behaviour under specific conditions of pressure and temperature.

Water is unique in its number of unusual, often called anomalous, properties. When hot it is a normal simple liquid; however, close to ambient temperatures properties, such as the compressibility ...