Method and apparatus for measuring subsurface characteristics us

Details Method and apparatus for measuring subsurface characteristics us Method and apparatus for measuring subsurface characteristics us

1987-02-19

1990-12-18

Howell, Janice A.

Radiant energy

Coded record and readers; invisible radiant energy type

250268, G01V 510

Patent

active

049788515

ABSTRACT:
Methods and apparatus for directly and more accurately assaying radiological characteristics of elements with a subsurface formation surrounding a bore hole. An instrument is provided which comprises a pulsed neutron source, a high resolution gamma ray detector and means for isolating a portion of the instrument in a neutron absorbing envelope comprised of a solution of fresh water and a neutron absorbing substance. This isolation means eliminates deleterious bore hole effects and maximizes the measurement of formation capture gamma rays. The applications of the present invention include measuring the presence of an element and measuring the ratio of two elements within a formation surrounding a bore hole.

REFERENCES:
patent: 2842678 (1958-07-01), Silverman
patent: 3665195 (1972-05-01), Youmans
patent: 4191884 (1980-03-01), Scott
patent: 4233508 (1980-11-01), Arnold
patent: 4287415 (1981-09-01), Arnold
patent: 4423323 (1983-12-01), Ellis et al.
patent: 4486658 (1984-12-01), Scott et al.

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