凝析气藏相对渗透率曲线修正模型研究

A Simple Modified Model of Relative Permeability Curve About Gas-Condensate Reservoirs

深入理解凝析气藏“凝析油堵塞”对油气相对渗透率曲线的影响,可以更好地进行凝析气藏的高效开发。在综合考虑凝析油气低界面张力和凝析油临界流动饱和度的基础上,对由传统试验手段所得的相对渗透率曲线进行了修正。修正后的相对渗透率曲线应用于拟稳态理论计算时,不同压力下的相对渗透率,尤其是气相的相对渗透率,明显变大。研究表明,传统实验手段所得的相对渗透率曲线用于凝析油气藏的开发时,误差较大。文中所建相对渗透率模型比较接近真实凝析气藏相对渗透率曲线,具有较高的精度,能用于凝析气藏的开发。

To efficiently exploit the gas-condensat.e reservoirs,the influence of the blockage of condensate oil to the relative permeability curve must be deeply comprehended. Taking the low IFT and the critical flowing saturation into consideration, the paper modifies the relative permeability curve from traditional experiment. If used in calculating psudo-state, the relative permeability under different pressure is getting bigger, especially the gas-phase relative permeability. The study indicates that the error is even worse using the relative permeability curve from traditional experiment on gas-condensate exploiting. The relative permeability model in this paper is closer to the true gas-condensate relative permeability in higher accuracy. So it can be used on the exploitation of gas-condensate reservoir.