Method and system for determining thermal neutron lifetime of ea

Details Method and system for determining thermal neutron lifetime of ea Method and system for determining thermal neutron lifetime of ea

1980-09-02

1982-09-21

Smith, Alfred E.

Radiant energy

Coded record and readers; invisible radiant energy type

G01V 500

Patent

active

043508880

ABSTRACT:
Methods and apparatus are provided for determining the thermal neutron lifetime of earth formations in the vicinity of a well borehole. The borehole environs are irradiated with pulses of fast neutrons. Between neutron pulses capture gamma rays are detected in at least six, non-overlapping, sequential time intervals and count rate signals representative thereof are generated. Comparisons of the six count rate signals are made to determine which ones have been affected by a borehole component. Only those count rate signals not affected by the borehole component are used to determine the thermal neutron lifetime by a least-squares fitting technique.

REFERENCES:
patent: 3566116 (1971-02-01), Nelligan
patent: 3662179 (1972-05-01), Frentrop et al.
patent: 3928763 (1975-12-01), Scott
patent: 4055763 (1977-10-01), Antkiw

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