Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1977-04-20
1978-10-24
Smith, Alfred E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250265, 250270, G01V 500
Patent
active
041223390
ABSTRACT:
An improved pulsed neutron porosity logging system is provided in the present invention. A logging tool provided with a 14 MEV pulsed neutron source, an epithermal neutron detector and an inelastic scattering gamma ray detector is moved through a borehole. The detection of inelastic gamma rays provides a measure of the fast neutron population in the vicinity of the detector. Repetitive bursts of neutrons irradiate the earth formation and, during the bursts, inelastic gamma rays representative of the fast neutron population is sampled. During the interval between bursts the epithermal neutron population is sampled along with background gamma radiation due to lingering thermal neutrons. The fast and epithermal neutron population measurements are combined to provide a measurement of formation porosity.
REFERENCES:
patent: 3491238 (1970-01-01), Allen
patent: 3509346 (1970-04-01), Mills et al.
patent: 3947683 (1976-03-01), Schultz et al.
Schultz Ward E.
Smith Michael P.
Smith, Jr. Harry D.
Beard William J.
Howell Janice A.
Ries Carl G.
Smith Alfred E.
Texaco Inc.
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