THE PHYSICAL AND THERMODYNAMICAL NATURE OF RETROGRADE CONDENSATION OF GAS-CONDENSATE SYSTEMS AT RESERVOIR CONDITION

Abstract

In this paper, the results of laboratory experimental investigations into retrograde phase transformations of gas-condensate systems were analyzed and it has been determined that, gas-condensate system becomes two-phased at the pressure above retrograde condensation or dew point pressure where aerosol form of liquid phase appears. Learning the process in the porous medium model and in parallel in the porous free PVT bomb at different temperature condition provided comparable data and strong justifications to describe the nature of retrograde condensation phenomena. Also, according to the results of the experimental data, a new approach has been developed to highlight some aspects of the natural occurrences in the reservoir condition. Taking all obtained observations into account the physical meaning of retrograde condensation at porous medium was discussed and these considerations were used to explain the dynamics of phase transformation in the reservoir during development of gas-condensate reservoirs.