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Simultaneous gamma ray measurement of formation bulk density and casing thickness

Patent ·
OSTI ID:5999511
; ;
A method for simultaneously measuring the formation bulk density and the thickness of casing in a cased well borehole is disclosed. Low energy gamma rays are emitted into the casing and formation in a cased borehole. Two longitudinally spaced detectors detect gamma rays scattered back into the borehole by the casing and surrounding earth materials. The count rate signals from the two detectors are appropriately combined according to predetermined relationships to produce the formation bulk density and the casing thickness, which are recorded as a function of borehole depth.
Assignee:
Halliburton Co
Patent Number(s):
US 4297575
OSTI ID:
5999511
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BOREHOLES
BULK DENSITY
CAVITIES
COUNTING RATES
DENSITY
DIMENSIONS
EQUIPMENT
GAMMA LOGGING
GEOLOGIC DEPOSITS
MEASURING INSTRUMENTS
MEASURING METHODS
MINERAL RESOURCES
OIL FIELDS
PETROLEUM DEPOSITS
PHYSICAL PROPERTIES
RADIATION DETECTORS
RADIOACTIVITY LOGGING
RESOURCES
SIGNALS
THICKNESS
WELL CASINGS
WELL LOGGING
WELL LOGGING EQUIPMENT