METHOD AND DEVICE FOR EVALUATING THE PHYSICAL PARAMETERS OF AN UNDERGROUND DEPOSIT USING ROCK CUTTINGS COLLECTED FROM IT

摘要

method and device for evaluating, at the same time and with the same equipment, physical parameters such as the absolute permeability and the porosity.from a fragment of natural or artificial fractured porous medium.we measure the porosity of the fragments by means of pressure testing of helium or other gas, using a protocol known per se.the compound which contains, is in communication with a reservoir of known volume, containing helium under a known pressure.a pressure balance, we can deduce the value of the solid volume. we also measured the volume of rock mass and the shell fragments.the combination of these measures are used to determine the porosity of the samples and the density of the rock.we then measured the permeability by soaking them in a liquid and with a chamber in communication with the liquid under pressure in an accumulator setin order to compress the gas trapped in the pores of the rock.through the modeling of the evolution of the volume of fluid injected into the enclosure, and an iterative adjustment, we determined the values of the physical parameters.application, for example, to petrophysical measurements from drill cuttings or crushed cores.