Pulsed radiation decay logging

Details Pulsed radiation decay logging Pulsed radiation decay logging

1979-06-25

1981-05-05

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250269, G01V 500

Patent

active

042661269

ABSTRACT:
Methods and apparatus for radioactive well logging in which the formation is irradiated with bursts of primary radiation and the resulting secondary radiation is measured during a plurality of time windows occurring subsequent to the primary radiation burst. A plurality of ratio functions are established which are representative of the radiation count rates measured during adjacent pairs of the time windows. The ratio functions are compared with each other and at least one ratio function is selected. The selected ratio function is employed to generate a signal representative of the decay rate of the secondary radiation. The invention may be employed in epithermal neutron decay logging and at least a portion of the time windows may be of successively greater lengths.

REFERENCES:
patent: 3379884 (1968-04-01), Youmans
patent: 3800150 (1974-03-01), Givens
patent: 4004147 (1977-01-01), Allen
patent: 4020342 (1977-04-01), Smith, Jr. et al.
patent: 4097737 (1978-06-01), Mills, Jr.

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