Method for simultaneous measurement of borehole and formation ne

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

1982-07-01

1984-01-03

Willis, Davis L.

Radiant energy

Coded record and readers; invisible radiant energy type

250262, G01V 500

Patent

active

044244444

ABSTRACT:
The present invention concerns methods for measuring simultaneously the formation and borehole components of thermal neutron lifetime as decay time. The borehole and formation are irradiated with pulsed 14 MEV neutrons. During the interval between neutron pulses the capture gamma radiation is measured in at least four, non-overlapping, contiguous time gates. A background radiation measurement is also periodically made. The background corrected capture gamma radiation measurements are combined to derive simultaneously, the formation and borehole neutron lifetime components which are then 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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