Pulsed neutron well logging apparatus having means for determini

Details Pulsed neutron well logging apparatus having means for determini Pulsed neutron well logging apparatus having means for determini

1977-11-02

1979-06-05

Willis, Davis L.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250269, 250270, G01V 500

Patent

active

041574699

ABSTRACT:
A neutron generator in a well logging instrument is periodically pulsed and has an off period between pulses of 1000 microseconds. A neutron detector is gated on at intervals of 400-500, 550-650, and 700-800 microseconds, respectively, following the termination of each burst of fast neutrons. Circuitry is provided for determining the background radiation by the equation: ##EQU1## where B is the background, and N.sub.1, N.sub.2 and N.sub.3 are the counts observed during the three gates, respectively. Circuitry is also provided for determining the macroscopic absorption (.SIGMA.) from the equation: ##EQU2## where V is the velocity of thermal neutrons, being a constant and .DELTA.t represents an increment of time.

REFERENCES:
patent: 3706884 (1972-12-01), Youmans

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