Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1982-09-13
1985-09-10
Smith, Alfred E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250270, G01V 510
Patent
active
045408831
ABSTRACT:
A neutron source in a well logging instrument is periodically pulsed and secondary radiations emanating from the irradiated formations are measured by a detector system. Circuitry is provided for establishing the points in time at which radiation is detected within a signal measurement time interval and generating a timing function relating to the time distribution of the detected pulses. Additionally, the total count rate for the detected pulses within the signal measurement interval and count rate of detected pulses within a background measurement time interval are processed to obtain a measurement of relative background intensity. The relative background intensity and a timing function for background only within the signal measurement interval are used to correct the timing function for total detected pulses to provide a timing function for only the exponential signal. Each value of corrected timing function will define a single value of the macroscopic absorption cross-section of the irradiated earth formations.
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A New Thermal Neutron Decay Logging System-TDT-M by J. E. Hall, C. W. Johnstone, J. L. Baldwin and L. A. Jacobson, an SPE Publication #9472; this paper was presented at the 55th Annual Fall Technical Conference and Exhibition of the Society of Petroleum Engineers of AIME, held in Dallas, Texas, Sep. 21-24, 1980.
Byron Richard M.
Dresser Industries Inc.
Fields Carolyn E.
McCollum Patrick H.
Smith Alfred E.
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