G - Physics – 01 – V
Patent
G - Physics
01
V
358/4
G01V 3/18 (2006.01) G01V 5/10 (2006.01)
Patent
CA 1095187
PULSED NEUTRON POROSITY LOGGING METHOD AND APPARATUS USING DUAL DETECTORS Abstract of the Disclosure. A source of fast neutrons and two differently spaced detectors are utilized in a well logging instrument, each of such detectors being responsive to the thermal neutron population decay rate. The inverse of this decay rate is proportional to the measured macroscopic absorption cross section (Sigma). The measured Sigma is obtained simul- taneously as a function of the radiation detected by each of two detectors. The signal generated which is indicative of the Sigma observed from one detector is subtracted from the Sigma observed by the second detector. The difference between the measured Sigma from two differently spaced detectors provides a unique function of the fluid-filled porosity of the formations giving rise to the measured Sigma values. -1a-
307651
Dresser Industries Inc.
Macrae & Co.
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