Logging tool for measuring the macroscopic thermal neutron captu

Details Logging tool for measuring the macroscopic thermal neutron captu Logging tool for measuring the macroscopic thermal neutron captu

1989-04-11

1990-08-28

Hannaher, Constantine

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250265, 250266, 250270, G01V 504, G01V 510

Patent

active

049528017

ABSTRACT:
For use in a downhole oil well logging tool which is enclosed in a sonde and suspended on an armored logging cable, a means for measuring the macroscopic thermal neutron capture cross section of the borehole fluid is set forth. In the preferred embodiment, a neutron source adjacent to a neutron detector is positioned in a sonde. The entire surrounding region in the well borehole is used as a sample chamber. Fast neutrons from the source after collision with fluid nuclei impinge on the detector which provides an output signal which is indicative of neutron flux. The count rate is most significantly dependent on the thermal neutron capture cross section of the borehole fluid. An additional detector can likewise be spaced farther from the neutron source and provide an alternate count rate. Through the use of two detectors, minor perturbations induced by changes in the environment outside the borehole can be compensated. The neutron capture cross section can be determined for the borehole fluid. Preferably, the sonde is supported for traveling along a cased well on centralizers to control the volume of fluid that is in the immediate vicinity of the neutron source which fluid may be characterized as falling within a test chamber region defined by the case 12.

REFERENCES:
patent: 4028546 (1977-06-01), Peelman et al.
patent: 4047028 (1977-09-01), Arnold
patent: 4384205 (1983-05-01), Flaum
patent: 4500781 (1985-02-01), Culver et al.
patent: 4760252 (1988-07-01), Albats et al.

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