Thermal neutron porosity measurement apparatus and method...

G - Physics – 01 – V

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G01V 5/10 (2006.01) G01N 15/08 (2006.01) G01N 23/202 (2006.01) G01N 23/222 (2006.01)

Patent

CA 2221901

An apparatus for measuring the porosity of earth formations penetrated by a wellbore. The apparatus includes an elongated housing adapted to traverse the wellbore, a controllable source which emits bursts of high-energy neutrons, a near detector primarily sensitive to thermal neutrons and axially spaced apart from the source, a far detector also primarily sensitive to thermal neutrons and axially spaced apart from the source so that the near detector is axially disposed between the source and the far detector. The apparatus includes a neutron shield disposed between the near detector and the far detector, and a neutron scattering insert disposed inside the housing between the source and the near detector. The scattering insert consists of a material selected from the group of aluminum, beryllium, graphite, silicon, potassium, magnesium, lead and sulfur. In a preferred embodiment, the scattering insert consists of aluminum.

Dispositif de mesure de la porosité des formations traversées par un trou de forage. Il comprend un boîtier allongé adapté pour passer dans le trou de forage, une source commandée qui émet des bouffées de neutrons à haute énergie, un détecteur rapproché principalement sensible aux neutrons thermiques et éloigné axialement de la source de sorte que le détecteur rapproché est placé axialement entre la source et le détecteur éloigné. Le dispositif comporte un écran contre les neutrons placé entre le détecteur rapproché et le détecteur éloigné, un insert de diffusion des neutrons placé dans le boîtier entre la source et le détecteur rapproché. L'insert de diffusion se compose d'un des matériaux du groupe suivant : aluminium, béryllium, graphite, silicium, potassium, magnésium, plomb et soufre. Dans une utilisation privilégiée, l'insert de diffusion est constitué d'aluminium.

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