Influence of Porous Media on the Phase Behavior Characteristics of Condensate Gas Reserviors Rich in CO2
Aiming at the problem of light hydrocarbon extraction and layering in the PVT experiment process of near-critical saturated condensate gas rich in CO2,in order to understand the influence of reservoir porous media on the phase behavior characteristics,the experimental study of the phase behavior of the formation fluid of this special condensate gas reservoir after continuous passing through the porous media was carried out using the real reservoir long core,and the observation of the formation fluid reverse condensation process in the reservoir under high temperature,high pressure and non-equilibrium state was carried out using the etching model.The results show that after the fluid passes through the reservoir porous media,the dew point pressure at the initial stage is lower than the result of PVT test,and the intermediate hydrocarbon content in the well fluid enriched by the fluid is lower than that of the original well fluid,but as the formation fluid continuously passes through the reservoir core,the intermediate hydrocarbon content in the well fluid composition gradually increases,until it is restored to the same content as the original well fluid,and the dew point pressure is close to the result of PVT test.The research results provide a basis for the refined evaluation of the phase characteristics of the CO2 rich condensate gas reservoir in the reservoir and the formulation of the development plan.
special condensate gas reservoirphase behaviorintermediate hydrocarbon adsorptionmicroscopic retrograde condensation visualization
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