Zero-dimension Simulation Study For Multi-component Reservoir

The variation of phase,component composition and physical property parameters is complex during the exploitation process of condensate gas reservoir.Using the "zero dimensional" model to study the law of these changes is the basis for the numerical simulation of the multi component reservoir and the development strategy.On the basis of lots of a large number of documents and papers,a flash model was established based on the material balance,equation of state and thermodynamic equilibrium.The flash model can be used to describe certain composition under different pressure and temperature.Based on the two-phase flash model,this paper presents the calculation models of composition bubble and dew point pressure phase envelope and liquid line.Combined with the actual development process of the reservoir and the simulation experiment of the phase state,the simulation model of the constant composition expansion,the constant volume depletion and gas injection production is studied.Secondly,the solving process and algorithm of these models are deeply studied,using the basic visual 6 is,these processes was programmed and made into executable software.Finally,combined with the actual reservoir data of the practical development process,phase behavior simulation calculation and development index calculation was conducted.the key research were the component changes during the constant composition expansion,the changes of condensate oil saturation,recovery and phase envelope during the constant volume depletion process,the effect of gas injection on condensate oil saturation and recovery.The research of this paper has important significance for understanding the law of phase change of the multi-component reservoir,and it can also provide some reference for the simulation and calculation of the development process of this kind of reservoir.