System for simultaneous measurement of borehole and formation ne

Details System for simultaneous measurement of borehole and formation ne System for simultaneous measurement of borehole and formation ne

1982-06-23

1983-06-14

Willis, Davis L.

Radiant energy

Coded record and readers; invisible radiant energy type

250262, G01V 500

Patent

active

043885292

ABSTRACT:
A system is disclosed for measuring simultaneously the formation and borehole components of thermal neutron lifetime or decay time. The borehole and formation are irradiated with 14 MEV pulsed neutrons. During the internal between neutron pulses capture gamma radiation is measured in at least four, non-overlapping, contiguous time gates. A background radiation measurement is also periodically made. Background corrected capture gamma ray measurements are combined to derive simultaneously the formation and borehole components of thermal neutron lifetime which are recorded as a function of borehole depth.

REFERENCES:
patent: 3930153 (1975-12-01), Scott
patent: 4122338 (1978-10-01), Smith, Jr. et al.
patent: 4152590 (1979-05-01), Smith, Jr. et al.
patent: 4157469 (1979-06-01), Randall
patent: 4223218 (1980-09-01), Jacobson
patent: 4315148 (1982-02-01), Randall

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