Unsteady porous flow mechanism affected by productivity compressibility of the bottom of well

The main power driving the oil flowing to the bottom of well are the rock and liquid elastic energy. Generally, invariable productivity of well is defined in elastic reservoir, but the productivity actually is variable because of the liquid compressibility. Therefore, the pressure of the bottom of well forecasted is lower in the production. Considering the effecting of the liquid compressibility for the “invariable productivity, the invariable productivity is altered based on the instantaneous well pressure. So the different well pressure is calculated by using the rule of superposition of pressure drop. Then 6 aspects are analyzed for the difference, and they are initial reservoir pressure, permeability, oil viscosity, thickness, productivity and production time. The result is that the difference affects the production plan of oil field in a certain extent because sometimes it even gets 10% value.