Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1980-07-28
1982-02-16
Willis, Davis L.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250269, G01V 500
Patent
active
043160867
ABSTRACT:
A pulsed source of fast neutrons and a radiation detector system are utilized in a well logging instrument, the detector being responsive to the thermal neutron population decay rate. The inverse of the decay rate is proportional to the measured macroscopic neutron absorption cross-section (Sigma) of the surrounding formations. A first Sigma is measured by taking the natural logarithm of the ratio of the detected radiation counts occurring within two measurement intervals. A second Sigma is measured by taking the natural logarithm of the ratio of the detected radiation counts occurring within a second pair of measurement intervals. The first Sigma value is recorded when the Sigma value falls below a preselected limit and the second Sigma value is recorded when the formation Sigma value is above the preselected limit. Thus, the Sigma log is a composite of the two Sigma measurements.
REFERENCES:
patent: 3379882 (1968-04-01), Youmans
patent: 3379884 (1968-04-01), Youmans
patent: 3691378 (1972-09-01), Hopkinson et al.
patent: 3706884 (1972-12-01), Youmans
patent: 4152590 (1979-05-01), Smith, Jr. et al.
patent: 4157469 (1979-06-01), Randall
Byron Richard M.
Dresser Industries Inc.
McCollum Patrick H.
Willis Davis L.
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