System for measuring epithermal neutron porosity having reduced

Details System for measuring epithermal neutron porosity having reduced System for measuring epithermal neutron porosity having reduced

1995-03-23

1996-07-02

Fields, Carolyn E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250266, 250268, 2502698, G01V 510

Patent

active

055324819

ABSTRACT:
The invention is a system for determining the epithermal neutron decay rate of an earth formation penetrated by a wellbore. A method according to the present invention includes the steps of irradiating the formation with bursts of high energy neutrons from a source disposed on a logging tool, detecting epithermal neutrons at a first detector primarily sensitive to epithermal neutrons entering the tool from the earth formation, detecting epithermal neutrons at a second detector primarily sensitive to epithermal neutrons entering the tool from the wellbore, determining a first time at which a maximum counting rate occurs the first detector, scaling the count rates at the second detector to match the count rate at the first detector at the first time, determining a second time at which both detectors measure the same count rate of thermal neutrons, and determining the formation epithermal neutron decay rate by solving a linear least-squares fit function of the difference in counting rates between the first and the second detectors occurring between the first time and a predetermined portion of the second time.

REFERENCES:
patent: 3487211 (1969-12-01), Youmans
patent: 4760252 (1988-07-01), Albats et al.
patent: 4910397 (1990-03-01), Mills et al.
patent: 5051581 (1991-09-01), Hertzog et al.
patent: 5068531 (1991-11-01), Allen et al.

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