Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1981-01-22
1984-02-07
Smith, Alfred E.
Radiant energy
Coded record and readers; invisible radiant energy type
250262, G01V 510
Patent
active
044305672
ABSTRACT:
In a gamma ray well logging instrument, a neutron generator is pulsed at a predetermined rate. Each neutron burst produces gamma radiation resulting from inelastic scattering and neutron capture. The detected gamma radiations are detected by a detector system within the logging instrument. The detected pulses are transmitted to the surface electronics where pulses occurring in the inelastic interval are directed to one section of a multi-channel analyzer and pulses from the capture interval are directed to another section of the analyzer. The use of address decoders and ratio circuits enables an electrical signal to be obtained which represents the ratio of the total capture gamma ray counts within an energy range to the total inelastic gamma ray counts within the same energy range. This electrical signal is representative of the porosity of the subsurface formations being irradiated by neutrons.
REFERENCES:
patent: 4020342 (1977-04-01), Smith, Jr. et al.
patent: 4168428 (1979-09-01), Culver
Chace David M.
Oliver Donald W.
Byron Richard M.
Dresser Industries Inc.
Fields Carolyn E.
McCollum Patrick H.
Smith Alfred E.
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