Transient Flow of Gas through Porous Media

This paper describes the numerical analysis and its application on the transient flow of gas centripetally inward or radially outward through the homogeneous porous media， caused by making in them a spherical hole in. which the pressure is suddenly droped or rised from its initial pressure and then held constant. Results of these analysis are shown in few diagrams' Practically，when we bore with ad rill in the media，and line the inside face except an end of the borehole，th is end of the borehole mey be regarded as as pherical hole in the media in such a case. If flow rates and pressure in the hole are measuaed，the permeability and porosity of the media can be estimated by using the above diagrams，a nd its example is shown in one part of this paper