CALCULATION OF THE PHASE EQUILIBRIUM OF A HYDROCARBON MIXTURE WITH REGARD FOR THE CAPILLARY PRESSURE JUMP IN IT BY THE EXAMPLE OF THE ASTRAKHAN FIELD

The infl uence of a capillary pressure jump in a porous medium on the equilibrium between its liquid and gas phases, defi ned by the Peng–Robinson equation of state, was investigated. A numerical analysis of the phase diagrams of a gas–condensate mixture, constructed in gas-pressure and liquid-pressure coordinates for diff erent capillary pressure jumps in the mixture, has been performed. The boundary of the two-phase region of such a mixture was determined as a domain of its existence in the two-phase state. The calculations were not associated with a concrete porous medium, and they were based on the condition of phase equilibrium of such a medium at diff erent capillary pressure jumps in it.
The infl uence of a capillary pressure jump in a porous medium on the equilibrium between its liquid and gas phases, defi ned by the Peng–Robinson equation of state, was investigated. A numerical analysis of the phase diagrams of a gas–condensate mixture, constructed in gas-pressure and liquid-pressure coordinates for diff erent capillary pressure jumps in the mixture, has been performed. The boundary of the two-phase region of such a mixture was determined as a domain of its existence in the two-phase state. The calculations were not associated with a concrete porous medium, and they were based on the condition of phase equilibrium of such a medium at diff erent capillary pressure jumps in it.
Author:  M. I. Raikovskii, A. Yu. Dem'yanov, O. Yu. Dinariev, D. V. Rudenko
Keywords:  capillary pressure jump, saturation, phase equilibrium, gas–condensate mixture, free energy
Page:  1516