Calculations of reservoir performance for petroleum reservoirs require accurate
knowledge of the volumetric behavior of hydrocarbon mixtures, both liquid
and gaseous. Coefficient of Isothermal oil compressibility is a measure of
the fractional change in volume with respect to pressure at constant temperature.
Coefficients of isothermal oil compressibility are usually obtained from
reservoir fluid analysis. Reservoir fluid analysis is an expensive and time consuming
operation that is not always available when the volumetric properties
of reservoir fluids are needed. For this reason correlations have been developed
and are being developed for predicting fluid properties including the
coefficient of isothermal oil compressibility.
This project developed a mathematical model for predicting the coefficient of
isothermal oil compressibility based on Peng-Robinson Equation of State (PR
EOS). A computer program was developed to predict the coefficient of isothermal
compressibility using the developed model. The predicted coefficient
of isothermal oil compressibility closely matches the experimentally derived
coefficient of isothermal compressibility at pressures above and below the
bubble point pressure.