Oilwell Inflow Considering Starting Pressure Gradient

In the low permeability reservoir,there exists a starting pressure gradient.And,in the water drive reservoir,when the flowing bottom-hole pressure is lower than the saturation pressure,the maximum production appears.Meanwhile the inflow performance relationship curve shifts to pressure axis.Therefore,in this study,a well inflow performance relationship equation,which takes starting pressure gradient into consideration,is established.It can be used for calculations under different well inflow pressure.The factors which influence well production are also analyzed in this study.