关键词: 凝析油气田, 多孔介质, 吸附, 凝聚, 相态, 渗流

Abstract: A phase equilibrium simulation method for prediction o[ gas condensale phase behavior in porous nedia is presented, in which iler-facial effects of udsurplion and capillary coacervalion are considered. The nlethod is applied to sludy of Yaha condensate gas reservoir's dew point (dp). retrograde condensale suluration in porous inedia and compare with conventional lab analysis o[ PVT. The results show such coiunrci-dent outcome similar to previous studies as upper dp inereasing, down dp declining and retrograde condensate saturation ascending,thus indi-cating the application of this method with porous media effeets is feasible. Introducing it into theory of gas condcnsate percolation, a physico-chemical percolation model of gas condensate system with adsorption and capillary coacervation effects can be developed, including mathemat-ical models for descriplion o[ relrograde condensale saturation distribution, relative permeability distribution to gas and pressure drop funnel dis-tribution in near wellbore formation of condensate gas reservoirs as well as gas condensate well productivity equation considering different inter-facial phenomena. All the above prediction and estination prove that the porous media interfacial effect could intensify such retrograde conden-sate phenomenon, give rise to additional formation damages of retrograde condensale behavior and result in the decrease of relative pernleabilily to gas and produclivity of gas condensate wells in Y aha condensate gas rcscrvoir.

Key words: condensale oil-gas field, porous media, adsorption, coacervation, phasc bchavior, percolation