Unsteady Percolation of Slightly Compressible Fluid

Abstract

As to the reservoirs with closed boundary without other energy supply or the supply boundary is very far and without enough edge water, the fluid is driven to the wells mainly through the elastic of the formation and the fluid itself. Because reservoirs always lie in the deeper formation which bears higher pressure, although the compressibility of the formation and the fluid is not big, but they are compressible. It is determined that the elastic action is not to be neglected within the time after switching wells and changing the work. So the percolation law under elastic drive mode must be researched. The method obtaining the parameters of the reservoir with the theory of the elastic unsteady percolation as its foundation is called transient (unsteady state) well testing. By the method of unsteady well testing, the parameters of the formation can be determined, the formation pressure and the boundary of reservoirs can be calculated, and the behavior of reservoir can be analyzed.