Method and apparatus for determining the permeability characteristics of a porous or fissured medium

摘要

A borehole is formed in the medium and divided along its axis into three adjacent cavities, separated from one another and comprising two protecting end cavities enclosing an intermediate measuring cavity. A flow of a liquid is produced in each of the cavities and in the regions of the corresponding medium. Measurements are effected of the flow-rate of liquid flowing in the intermediate cavity and of the liquid pressure in intermediate cavity and in the corresponding region of the medium, at known distances from the axis of the borehole.