Method for induced gamma ray logging
This patent describes a nuclear well logging operation. A method is described for determining a parameter responsive to the condition of a borehole transversing a subsurface earth formation, comprising the steps of: cyclically irradiating the subsurface earth formation with bursts of high energy neutrons; detecting for one or more burst cycles the impingement of gamma radiation upon a first gamma radiation detector means during and between each of the bursts; determining first count of detected impingements of primarily inelastic gamma radiation upon the first detection means; and normalizing the first count to remove the effects upon the first count of variations in the bursts of high energy neutrons, the normalized first count producing the parameter responsive to the condition of the borehole.
- Assignee:
- Dresser Industries, Inc., Dallas, TX
- Patent Number(s):
- US 4645926
- Application Number:
- TRN: 87-014275
- OSTI ID:
- 6681343
- Resource Relation:
- Patent File Date: Filed date 10 Apr 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
47 OTHER INSTRUMENTATION
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
GAMMA DETECTION
RADIATION DETECTORS
NATURAL GAS DEPOSITS
NEUTRON-GAMMA LOGGING
PETROLEUM DEPOSITS
BOREHOLES
GAMMA RADIATION
NEUTRONS
BARYONS
CAVITIES
DETECTION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
GEOLOGIC DEPOSITS
HADRONS
IONIZING RADIATIONS
MEASURING INSTRUMENTS
MINERAL RESOURCES
NEUTRON LOGGING
NUCLEONS
RADIATION DETECTION
RADIATIONS
RADIOACTIVITY LOGGING
RESOURCES
WELL LOGGING
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration
440400 - Well Logging Instrumentation
440101 - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments