Method and device for evaluating physical parameters of an...

G - Physics – 01 – N

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G01N 15/08 (2006.01)

Patent

CA 2474712

The invention concerns a method and a device for evaluating simultaneously and with the same equipment, physical parameters such as absolute permeability and porosity, of fragments extracted from a fragmented natural or artificial porous environment. It consists in measuring the porosity of the fragments with helium pressure tests in accordance with a protocol known per se. The enclosure (1) which contains them is communicated with a reservoir (11) of volume likewise known per se, containing helium under pressure known per se. From the equilibrium of the pressures can be deduced the value of the solid volume. The rock envelope volume and the mass of fragments are also measured. By combining those measurements, the porosity of the samples as well as the rock density is determined. Then their permeability is measured by immersing them in a viscous fluid and communicating the enclosure with the viscous fluid under specific pressure contained in a container (9) so as to compress the gas trapped in the pores of the rock, in accordance with two different protocols. By modelling the evolution of the pressure or the volume in the enclosure, and iterative adjustment, the values of the physical parameters are determined. The invention is applicable, for example, to petrophysical measurements from bore cuttings or crushed cores.

Méthode et dispositif pour évaluer dans le même temps et avec le même appareillage, des paramètres physiques tels que la perméabilité absolue et la porosité, de fragments extraits dãun milieu poreux naturel ou artificiel fragmenté. On mesure la porosité des fragments au moyen de tests de pression à lãhélium suivant un protocole connu en soi. Lãenceinte (1) qui les contient, est mise en communication avec un réservoir (11) de volume connu également, contenant de lãhélium sous une pression connue. A lãéquilibre des pressions, on peut déduire la valeur du volume solide. On mesure également le volume enveloppe de roche et la masse en fragments. En combinant ces mesures, on détermine la porosité des échantillons ainsi que la densité de la roche. On mesure ensuite leur perméabilité en les immergeant dans un fluide visqueux et en mettant lãenceinte en communication avec du fluide visqueux sous une pression définie contenu dans un récipient (9) de manière à comprimer le gaz piégé dans les pores de la roche, suivant deux protocoles différents. Par le biais dãune modélisation de lãévolution de la pression ou du volume dans lãenceinte, et dãun ajustement itératif, on détermine les valeurs des paramètres physiques. Applications par exemple à des mesures pétrophysiques à partir de déblais de forage ou de carottes concassées.

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