Pulsed neutron well logging system and method with synchronizati

Details Pulsed neutron well logging system and method with synchronizati Pulsed neutron well logging system and method with synchronizati

1980-06-25

1982-07-13

Willis, David L.

Radiant energy

Coded record and readers; invisible radiant energy type

G01V 500

Patent

active

043396631

ABSTRACT:
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.

REFERENCES:
patent: 3609366 (1971-09-01), Schwartz
patent: 3925749 (1975-12-01), McLaughlin et al.
patent: 3930154 (1975-12-01), Scott
patent: 4136278 (1979-01-01), Oliver
patent: 4168428 (1979-09-01), Culver
patent: 4239965 (1980-12-01), Oliver et al.

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