Patent ID: 6453727
Filing Date: 2002-09-24
Classification: G01N

Abstract:
A method of evaluating physical parameters such as the absolute permeability of porous rocks of a zone of an underground reservoir, from fragments taken from this zone, characterized in that it comprises:immersing fragments (F) in a viscous fluid contained in a containment vessel (1), a stage of injection, into the vessel, of this fluid under a pressure that increases with time, up to a determined pressure threshold, so as to compress the gas trapped in the pores of the rock, a relaxation stage with injection stop, measuring the evolution of the pressure in vessel (1) during the two injection and relaxation stages, modelling the evolution of the pressure during the injection and relaxation process, from initial values selected for the physical parameters of fragments (F), and a stage of iterative adjustment of the values of the physical parameters of the rock fragments so that the modelled evolution is best adjusted to the measured evolution of the pressure in the vessel.