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Gain stabilized natural gamma ray detection of casing thickness in a borehole

Patent ·
OSTI ID:6311832
;
A gain stabilized natural gamma ray spectroscopy system is used to measure casing thickness in a cased well borehole. A ratio of gamma ray intensity in two selected energy ranges forms a measurement signal representative of casing thickness based on the photoelectric absorption of natural gamma rays by iron. A coincidence technique employing dual scintillation crystals and a stabilization source of charged particles and known energy gamma rays is used for gain stabilization.
Assignee:
Halliburton Company
Patent Number(s):
US 4450354
OSTI ID:
6311832
Country of Publication:
United States
Language:
English

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Related Subjects

42 ENGINEERING
420206* -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
440105 -- Radiation Instrumentation-- Radiometric Instruments-- (-1987)
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ABSORPTION
BOREHOLES
CAVITIES
CHARGED PARTICLES
CRYSTALS
ELEMENTS
GAMMA LOGGING
IRON
MEASURING INSTRUMENTS
METALS
NATURAL RADIOACTIVITY
PHOTOELECTRIC EFFECT
PHOTOELECTROMAGNETIC EFFECTS
RADIOACTIVITY
RADIOACTIVITY LOGGING
RADIOMETRIC GAGES
SCINTILLATIONS
SIGNALS
SORPTIVE PROPERTIES
SURFACE PROPERTIES
THICKNESS GAGES
TRANSITION ELEMENTS
WELL CASINGS
WELL LOGGING