Radial density information from a betatron density sonde

G - Physics – 01 – V

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G01V 5/12 (2006.01) G01V 5/04 (2006.01)

Patent

CA 2678607

An apparatus and a method for determining characteristics of earth formations traversed by a borehole that compensates the mudcake and standoff effects with fewer than usual detectors (16). The apparatus includes a radiation source (11) effective to generate first and, spatially as well as temporally separate, second X-rays for irradiating earth formations from first and second entrance angles (13, 15), one or more X-ray detectors (16) capable of generating a first and a second signal indicative of the intensity of the first and second X-rays (12, 14) returned from earth formations to the detectors and a housing accommodating the radiation source and the detectors.

L'invention porte sur un appareil et sur un procédé pour déterminer des caractéristiques de formations terrestres traversées par un forage, qui compensent les effets de cake et de distance annulaire avec moins de détecteurs que d'habitude. L'appareil comprend une source de rayonnement efficace pour générer un premier rayon X et, séparés aussi bien spatialement que temporellement, un second rayon X pour irradier des formations terrestres avec un premier et un second angle d'entrée, un ou plusieurs détecteurs de rayons X aptes à générer un premier et un second signal indicatif de l'intensité des premier et second rayons X renvoyés des formations terrestres aux détecteurs, et un boîtier contenant la source de rayonnement et les détecteurs.

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