Apparatus for measuring the permeability of ground and more particularly formations with very low permeability, of the pulse test type

摘要

The present invention relates to an apparatus for measuring the permeability of ground and more particularly formations with very low permeability, of the pulse test type. This apparatus is characterised in that it comprises a measurement tube 3 driven forcibly into a hole 2 drilled in the ground, with a diameter which is slightly smaller than the external diameter of the tube 3, this tube being driven in up to a certain distance from the bottom of the bore, the upper end of the tube being closed in a water-tight manner and being connected to pipes, via valves, to a pressurised water source 7 and to an assembly 10 continuously measuring the pressure existing in the tube 3. IMAGE