Three frequency modulated thermal neutron lifetime log

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

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250262, 250391, G01V 500

Patent

active

039406130

ABSTRACT:
Methods are disclosed for measuring simultaneously the thermal neutron lifetime of the borehole fluid and earth formations in the vicinity of a well borehole. A harmonically intensity modulated source of fast neutrons is used to irradiate the earth formations with fast neutrons at three different intensity modulation frequencies. Intensity modulated clouds of thermal neutrons at each of the three modulation frequencies are detected by a single spaced detector and the relative phase shift of the thermal neutrons with respect to the fast neutrons is determined at each of the three modulation frequencies. These measurements are then combined to determine simultaneously the thermal neutron decay time of the borehole fluid and the surrounding earth formation media.

REFERENCES:
patent: 3133195 (1964-05-01), Jones et al.
patent: 3171961 (1965-03-01), Yule
patent: 3638484 (1972-02-01), Tixier

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