Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1977-04-20
1979-01-09
Smith, Alfred E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250265, 250269, G01V 500
Patent
active
041340116
ABSTRACT:
An improved measurement of earth formation porosity is provided by the present invention using measurements of the energy spectrum of fast neutrons. A continuous source of fast neutrons is used to irradiate earth formations penetrated by a well borehole. Two neutron detectors, a fast neutron detector sensitive in the high energy range of the fast neutron energy spectrum, and an epithermal neutron detector, sensitive in the lower energy range of fast neutrons, are spaced at the same effective distance from the neutron source. Measurements of the neutron population at each detector are combined according to predetermined relationships to derive a measurement of earth formation porosity.
REFERENCES:
patent: 3080478 (1963-03-01), Scherbatskoy
patent: 3240938 (1966-03-01), Hall
patent: 3774033 (1973-11-01), Scott et al.
patent: 3869608 (1975-03-01), Scherbatskoy
Brooks, F. D., "A Scintillation Counter with Neutron and Gamma-Ray Discriminators." (United Kingdom Atomic Energy Authority, Harwell, Berks, Eng.), Nuclear Instr. & Methods 4, 151-163, (1959) Apr.
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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