Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1975-05-12
1976-09-07
Borchelt, Archie R.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250269, 250270, G01V 500
Patent
active
039793001
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, together with the formation porosity. 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 dual spaced detectors and the relative phase shift of the thermal neutrons with respect to the fast neutrons is determined at each of the three modulation frequencies at each detector. These measurements are then combined to determine simultaneously the thermal neutron decay time of the borehole fluid, the thermal neutron decay time of surrounding earth formation media and the porosity of the formation media.
REFERENCES:
patent: 3691378 (1972-09-01), Hopkinson et al.
patent: 3800150 (1974-03-01), Givens
patent: 3914603 (1975-10-01), Paap et al.
Arnold Dan M.
Paap Hans J.
Smith Michael P.
Beard William J.
Borchelt Archie R.
Ries C. G.
Texaco Inc.
Whaley T. H.
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