Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1994-03-28
1995-04-11
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
2502696, 2502698, G01V 510
Patent
active
054060788
ABSTRACT:
A system for measuring fast neutron induced gamma ray energy spectra in cased wellbores. The system includes an electronic source of monoenergetic 14 MeV fast neutrons, a high density bismuth germanate scintillation detector, a downhole pulse height analyzer and a highly accurate gain stabilizer circuit. The gain stabilization utilizes the iron (Fe) edge in the catpure gamma ray spectrum to establish system gain since iron is always present in the tool case and the wellbore casing.
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Halliburton Logging Services Inc.
Hannaher Constantine
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