Apparatus and method for minimizing wear and wear related...

G - Physics – 01 – V

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G01V 5/08 (2006.01) E21B 47/00 (2006.01) E21B 47/01 (2006.01) E21B 47/14 (2006.01) G01V 5/12 (2006.01)

Patent

CA 2454525

A tool is presented for making density measurements of a formation surrounding a wellbore, comprising a collar housing in a drill string. The housing has at least one first section with a first outer diameter, and at least one sensing section with a second outer diameter located proximate the at least one first section. The second. outer diameter is smaller than the first outer diameter. A radioactive source is disposed in the sensing section of the housing. At least two detectors are disposed in the sensing section and spaced from the radioactive source and are positioned to detect radiation resulting from gamma rays emitted by the source.

L'invention concerne un outil permettant d'effectuer des mesures de densité d'une formation entourant un puits de forage. Cet outil comprend un logement de collier dans une colonne de forage. Le logement comprend au moins une première section présentant un premier diamètre externe et au moins une section de détection présentant un second diamètre externe situé à proximité de la première section. Le second diamètre externe est inférieur au premier diamètre externe. Une source radioactive est déposée dans la section de détection du logement. Au moins deux détecteurs sont disposés dans la section de détection et espacés de la source radioactive et ils sont positionnés de manière à détecter un rayonnement issu de rayons gamma émis par la source.

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