Pulsed neutron well logging system and method with synchronization/stabilization pulse verification means

Patent · Tue Jul 13 04:00:00 EDT 1982

OSTI ID:6708922

Brown, W K

A well logging system and method involves the use of a well logging tool in a borehole traversing an earth formation which includes a pulsed neutron generator periodically bombarding the earth formation with neutrons. A scintillation-type detector detects gamma radiation from the earth formation and provides electrical data pulses corresponding in pulse height and frequency to the detected gamma radiation. Another circuit provides synchronization/stabilization pulses which are time related to the neutron bombardments of the formation. A cable conducts the data pulses and the synchronization/stabilization pulses uphole to surface electronics. A receiver with surface electronics processes the pulses and provides them to a gate circuit which passes or blocks the data pulses and the synchronization/stabilization pulses in accordance with a gate signal. The passed pulses are provided to a pulse height analyzer. The synchronization/stabilization pulses are also provided by the receiver to a gate signal network which provides the gate signal in accordance with the synchronization/stabilization pulses.

• Assignee: Texaco Inc
• Patent Number(s): US 4339663
• OSTI ID: 6708922
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
011000 -- Coal
Lignite
& Peat-- Reserves
Geology
& Exploration
02 PETROLEUM
020200 -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
15 GEOTHERMAL ENERGY
150303 -- Geothermal Exploration & Exploration Technology-- Exploratory Drilling & Well Logging
440400* -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BOREHOLES
CAVITIES
ELECTROMAGNETIC RADIATION
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
FUNCTION GENERATORS
GAMMA RADIATION
GATING CIRCUITS
IONIZING RADIATIONS
MEASURING INSTRUMENTS
NEUTRON LOGGING
PULSE GENERATORS
PULSED NEUTRON TECHNIQUES
RADIATION DETECTORS
RADIATIONS
RADIOACTIVITY LOGGING
SCINTILLATION COUNTERS
STABILIZATION
SYNCHRONIZATION
WELL LOGGING
WELL LOGGING EQUIPMENT