Simultaneous oxygen and silicon neutron activation well log using pulsed neutron source

Patent · Tue Mar 09 04:00:00 EST 1976

OSTI ID:7362413

Peelman, H E

Disclosed is a well logging system for performing a continuous log of the oxygen and silicon content of earth formations in the vicinity of a well bore. A downhole sonde housing a pulsed source of 14 MeV neutrons is used to irradiate earth formations in the vicinity of the well bore. A NaI(Tl) detector spaced approximately 25/sup 3///sub 8/ inches from the source detects gamma rays caused by neutron activation of elemental oxygen and silicon in the formations and produces voltage pulses representative of the elemental oxygen and silicon. The voltage pulses are transmitted to the surface where they are separated, corrected for background radiation and plotted continuously as a function of bore hole depth. The resultant well log traces may be interpreted in terms of lithology or formation water saturation by the use of disclosed techniques.

• Assignee: Texaco Inc.
• Patent Number(s): US 3943362
• OSTI ID: 7362413
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
440105 -- Radiation Instrumentation-- Radiometric Instruments-- (-1987)
440400* -- Well Logging Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
47 OTHER INSTRUMENTATION
ACTIVATION ANALYSIS
BARYONS
CHEMICAL ANALYSIS
CRYOGENIC FLUIDS
ELEMENTARY PARTICLES
ELEMENTS
EQUIPMENT
FAST NEUTRONS
FERMIONS
FLUIDS
HADRONS
MEASURING INSTRUMENTS
NEUTRON ACTIVATION ANALYZERS
NEUTRON LOGGING
NEUTRON SOURCES
NEUTRON-GAMMA LOGGING
NEUTRONS
NONMETALS
NUCLEONS
OXYGEN
PARTICLE SOURCES
PULSED NEUTRON TECHNIQUES
RADIATION DETECTORS
RADIATION SOURCES
RADIOACTIVITY LOGGING
SCINTILLATION COUNTERS
SEMIMETALS
SILICON
SOLID SCINTILLATION DETECTORS
WELL LOGGING