Downhole neutron activation measurement

G - Physics – 01 – T

Patent

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G01T 3/08 (2006.01)

Patent

CA 2729642

Systems and methods for measuring neutron-induced activation gamma-rays in a subterranean formation are provided. In one example, a downhole tool for measuring neutron-induced activation gamma-rays may include a neutron source and a gamma-ray detector. The neutron source may emit neutrons according to a pulsing scheme that includes a delay between two pulses. The delay may be sufficient to allow substantially all neutron capture events due to the emitted neutrons to cease. The gamma-ray detector may be configured to detect activation gamma-rays produced when elements activated by the emitted neutrons decay to a non-radioactive state.

L'invention concerne des systèmes et des procédés destinés à mesurer des rayons gamma d'activation neutronique dans une formation souterraine. Dans un exemple, un outil de fond destiné à mesurer des rayons gamma d'activation neutronique peut comprendre une source de neutrons et un détecteur de rayons gamma. La source de neutrons peut émettre des neutrons selon un rythme d'impulsions comprenant un temps d'attente entre deux impulsions. Ledit temps d'attente peut être suffisant pour permettre à sensiblement tous les événements de capture de neutrons dus aux neutrons émis de prendre fin. Le détecteur de rayons gamma peut être configuré de façon à détecter des rayons gamma d'activation produits lorsque des éléments activés par les neutrons émis se désintègrent jusqu'à un état non radioactif.

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