Analysis and prediction of water cut rising law of Triassic lower reservoir in 1block of Tahe oilfield

According to the equations describing the three basicpatterns of water cut rising,the water cut rising mode of 1block in Tahe oilfield belongs to S type.Based on the theory of water drive,Tong's standard chart suitable for 1 block in Tahe oilfield is determined,which predicts the ultimate recovery in1 block of Tahe.On the basis of distribution equation and the relative permeability,the relation between the water cut rising rate,water cut and recovery degree is deduced.The practice shows that in 1 block of Tahe area,when the recovery degree is more than 19%,Tong's standard chart theory predicting the water cut and water cut rising rate,which are highly consistent with actual situation.