Borehole invariant neutron porosity measurement system

G - Physics – 01 – V

Patent

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Details

G01V 5/08 (2006.01) E21B 47/12 (2006.01) E21B 49/00 (2006.01) G01N 15/08 (2006.01)

Patent

CA 2202310

This invention is directed toward the determination of porosities of earth formations penetrated by a borehole, and more specifically is directed toward the determination of porosities of earth formations while the borehole is being drilled. Borehole invariant neutron porosity measurements are obtained using a borehole tool which provides the response of two detectors spaced axially at different spacings from a neutron source. No independent measure of borehole geometry is required to correct the resulting porosity measurements for variations in borehole size or variations of the position of the borehole tool within the borehole.

La présente invention a trait à la détermination de la porosité des formations de terrain traversées par un trou de forage, et porte plus précisément sur la détermination de la porosité des formations de terrain pendant le forage du trou. Les mesures invariantes neutroniques de porosité dans un trou de forage sont obtenues à l'aide d'un outil de fond qui fournit la réponse de deux détecteurs séparés dans le sens axial selon différents espacements par rapport à une source de neutrons. Aucune mesure indépendante de la géométrie du trou n'est nécessaire pour corriger les mesures de porosité obtenues pour ce qui est des variations de diamètre du trou de forage ou des variations de l'emplacement de fond dans le trou de forage.

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