Study on inflow performance relationship of condensate reservoir considering high velocity flow effect

The exist of condensate oil saturation formed when the PBH is lower than the dew point pressure will reduce deliverability of gas condensate well.So,to control the pressure difference becomes the principle of production system determination for gas condensate well,which neglects the effect of non-equilibrium phase change caused by high velocity flow.The phase change of gas condensate system shows its characteristic of non-equilibrium when the temperature and pressure change rate of the environment exceed the phase change rate of gas condensate system.It has been found in numerous experimental researches that non-equilibrium phase change effect caused by high velocity flow have noticeable effect on condensate oil saturation within the immediate vicinity and productivity of the well.Condensate oil can’t be produced immediately with high rate of pressure drop.Based on non-equilibrium phase change law and the distribution of flow parameters near well bore,the non-equilibrium effect of gas condensate flow is evaluated in the paper.The formula considering of non-equilibrium phase change effect is presented for the calculating the distribution of condensate oil saturation.By contrast of different inflow performance relationship models and condensate oil saturation distributions,it is indicates that to enlarge the pressure difference can increase the productivity by enhancing the effect of non-equilibrium phase change and decreasing the condensate oil saturation.