Borehole compensated oxygen activation nuclear well logging

Details Borehole compensated oxygen activation nuclear well logging Borehole compensated oxygen activation nuclear well logging

1981-08-03

1985-02-26

Smith, Alfred E.

Radiant energy

Coded record and readers; invisible radiant energy type

250266, 250390, G01V 510

Patent

active

045019649

ABSTRACT:
Formations adjacent a well borehole are activated with neutrons from a pulsed neutron source in a sonde at an energy level, such as 14 MeV, to energize oxygen present in the formation and borehole, giving rise to gamma radiation from O.sup.16 (n,p)N.sup.16 reaction. Gamma radiation in the energy windows 3.25-4.00 MeV and 4.75-7.20 MeV is detected in a time gated detector and counted. Count rate contributions from the borehole and from the formation are differentiated on the basis of radial distance from the center of the sonde. In this manner, compensation for adverse effects of borehole oxygen activation on formation oxygen activation measurements of interest is achieved. Further, the neutron output intensity of the pulse neutron source may also be measured.

REFERENCES:
patent: 3465151 (1969-09-01), Youmans
patent: 3710112 (1973-01-01), Caldwell et al.
patent: 4233508 (1980-11-01), Arnold

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