Numerical Reservoir Simulation Considering Threshold Pressure Gradient and Stress Sensitive Phenomenon

The remaining permeability coefficient of stress sensitive rock is derived.Also the function between the threshold pressure gradient and pressure difference is obtained.Then the oil water relative permeability curve considering the stress sensitive phenomenon is perceived.After all these are completed,the numerical simulation considering stress sensitive phenomenon in low permeability reservoir is tried.Keywords such as ROCKTABH and Threshold Pressure are applied in order to take features of stress sensitive and threshold pressure gradient into consideration.The results prove that after stress sensitive and threshold pressure gradient are considered,the oil phase becomes harder to move while relatively the water becomes easier to move.The pressure gradient between the injection well and the production well is bigger,and the oil saturation decreases slowly.The water-free production period is shorted with a bigger increased rate of water cut and finally a smaller oil recovery rate is achieved.