Epithermal neutron die-away logging

Patent · Tue May 20 04:00:00 EDT 1986

OSTI ID:5671235

Mills, Jr, W R; Allen, L S

A system is described for epithermal neutron die-away logging of subterranean formations surrounding a borehole comprising: (a) a source of fast neutrons, for irradiating the formations surrounding a borehole, (b) a neutron counter for counting epithermal neutrons returning to the borehole from the irradiated formations, (c) a neutron filter surrounding the neutron counter having a thickness so as to permit the longest possible delay time following each burst of fast neutrons from the source before the epithermal neutrons from the irradiated formations are detected by the neutron counter while at the same time optimizing the epithermal neutron counting rates by minimizing thermal neutron effects.

• Assignee: Mobil Oil Corp., New York, NY
• Patent Number(s): US 4590370
• OSTI ID: 5671235
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BARYONS
BOREHOLES
CAVITIES
DIMENSIONS
ELEMENTARY PARTICLES
EPITHERMAL NEUTRONS
FAST NEUTRONS
FERMIONS
GEOLOGIC DEPOSITS
HADRONS
IRRADIATION
MEASURING INSTRUMENTS
MINERAL RESOURCES
NEUTRON DETECTORS
NEUTRON LOGGING
NEUTRON-NEUTRON LOGGING
NEUTRONS
NUCLEONS
PETROLEUM DEPOSITS
RADIATION DETECTORS
RADIOACTIVITY LOGGING
RESOURCES
THERMAL NEUTRONS
THICKNESS
WELL LOGGING