Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Thermal neutron die away logging system with optimized gating

Patent ·
OSTI ID:6423936
;
A system for measuring the thermal neutron lifetime of earth formations in the vicinity of a well borehole is disclosed. A downhole sonde is equipped with a pulsed neutron source, a thermal neutron or gamma ray detector and a pair of measurement electrodes. The measured salinity of the borehole fluid is used to optimize the delay time to the opening of measurement gating intervals for signals from the detector.
Assignee:
Texaco Inc.
Patent Number(s):
US 4122338
OSTI ID:
6423936
Country of Publication:
United States
Language:
English

Similar Records

Three frequency modulated thermal neutron lifetime log
Patent · Mon Feb 23 23:00:00 EST 1976 · OSTI ID:7353147
Three frequency modulated combination thermal neutron lifetime log and porosity
Patent · Tue Sep 07 00:00:00 EDT 1976 · OSTI ID:7251254
System for measuring earth formation thermal neutron lifetime utilizing a harmonically intensity modulated fast neutron source
Patent · Mon Dec 29 23:00:00 EST 1975 · OSTI ID:4042789

Related Subjects

02 PETROLEUM
020200 -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
440400* -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BARYONS
BOREHOLES
CAVITIES
DECAY
DELAY CIRCUITS
DESIGN
ELECTRODES
ELECTRONIC CIRCUITS
ELEMENTARY PARTICLES
FERMIONS
FLUIDS
GEOLOGIC FORMATIONS
HADRONS
LIFETIME
MEASURING METHODS
NEUTRON LOGGING
NEUTRON SOURCES
NEUTRON-NEUTRON LOGGING
NEUTRONS
NUCLEONS
OPERATION
PARTICLE SOURCES
PROBES
PULSED NEUTRON TECHNIQUES
RADIATION SOURCES
RADIOACTIVITY LOGGING
ROCKS
SALINITY
THERMAL NEUTRONS
WELL LOGGING