凝析液析出对凝析气藏产能的影响

INFLUENCE ANALYSIS OF THE CONDENSATE LIQUID PRECIPITATION ON THE PRODUCTIVITY OF CONDENSATE RESERVOIR

凝析气藏的开发过程中，当凝析气井井筒压力降低到露点压力以下，会出现凝析液的析出，进而影响到凝析气井的产能。探讨了凝析液析出液膜厚度对多孔介质孔隙度、渗透率的影响，建立了耦合产能方程，就各参数对产能的影响进行了分析。研究发现三区渗流模型较单区模型或双区模型更合理，能准确描述不同渗流区的流动特征，更加适用于凝析气藏试井分析；两相流动区流动半径和气相渗透率等因素对凝析气井产能有重要影响。

In the course of the development of condensate gas reservoir, when the borehole pressure reduces below dew-point pressure in the gas well, the condensate liquid maybe drops out, thus the productivity of the well will be influenced. The influence of the film thickness of the liquid on the porosity and permeability of the porous media has been explored, the coupling productivity equation is established and furthermore the analyses of various parame- ters on the productivity are conducted. The studies show that the flow model of Area 3 is more reasonable than the individual or dual area models because of the flow characteristics of the different flow areas can be correctly de- scribed and furthermore more adaptable to the analysis of the well test for the condensate gas reservoirs ; the factors such as flow radiu, gas permeability and so on possess an important influence on the productivity of the condensate gas wells.