Determination of reasonable pressure difference for condensate gas reservoir

The numerous experiments show that non-equilibrium phase change caused by high-velocity flow has noticeable effects on the condensate oil saturation within the immediate vicinity and productivity of oil well. Based on the non-equilibrium phase change law and the distribution of flow parameters near well bore, the non-equilibrium effect of condensable gas flow was evaluated. A formula for calculating the distribution of condensate oil saturation in consideration of the effect of non-equilibrium phase change is presented. The contrast of different inflow performance relationship models and condensate oil saturation distributions indicates that enlargement of pressure difference can increase the productivity by enhancing the effect of non-equilibrium phase change and decreasing the condensable oil saturation. A reasonable method for determination of pressure difference taking condensate oil saturation distribution as a key factor is proposed.