Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1980-11-17
1983-05-24
Smith, Alfred E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250270, G01V 500
Patent
active
043852351
ABSTRACT:
Circuitry is provided for establishing the points in time at which radiation is detected following neutron bursts in pulsed neutron logging. Means are provided to generate a signal indicative of the average time measurement of a predetermined number of detected pulses within a detection gate interval. A first counter circuit establishes a time position for each detected pulse within the detection interval. The time measurement signal is loaded into a down counter which transfers the individual time to a third accumulator circuit where the times signals for a predetermined number of detected pulses are compiled. The total time signal is averaged by dividing the accumulated value by the predetermined number of processed pulses. The resultant value is used to establish the macroscopic thermal neutron capture cross-section of the formation.
REFERENCES:
patent: 3133195 (1964-05-01), Jones et al.
patent: 3435216 (1969-03-01), Givens
patent: 3609366 (1971-09-01), Schwartz
patent: 4046764 (1977-09-01), Marquis
Byron Richard M.
Dresser Industries Inc.
Howell Janice A.
McCollum Patrick H.
Smith Alfred E.
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