Thermal neutron porosity measurement apparatus and method using

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods

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2502694, G01V 510

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active

057897522

ABSTRACT:
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.

REFERENCES:
patent: 2914677 (1959-11-01), Arnold
patent: 3529160 (1970-09-01), Moran
patent: 3621255 (1971-11-01), Schwartz
patent: 3823319 (1974-07-01), Tittman
patent: 4005290 (1977-01-01), Allen
patent: 4122340 (1978-10-01), Smith, Jr. et al.

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