Zero-spaced epithermal neutron moisture detection system

Details Zero-spaced epithermal neutron moisture detection system Zero-spaced epithermal neutron moisture detection system

1994-05-26

1996-01-09

Fields, Carolyn E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

25039005, G01T 510

Patent

active

054830630

ABSTRACT:
The present invention is directed toward the determination of moisture content per unit volume of material penetrated by a gas filled borehole. An alternate application of the invention is the detection of fractures and vugular cavities in the immediate vicinity of a liquid filled borehole. The apparatus comprises a probe which is conveyed along the borehole. The probe contains a source of neutrons and an epithermal neutron detector at essentially zero longitudinal spacing from the neutron source along the axis of the borehole. In the preferred embodiment, the neutron source is Californium-252 and the epithermal neutron detector comprises a glass scintillator. The response of the system is independent of the thermal neutron absorption properties of the material and the fluid within the borehole.

REFERENCES:
patent: 3428806 (1969-02-01), Wack
J. R. Hearst et al., "A Comparison of Moisture Gauge and Neutron Login Air-Filled Holes", Lawrence Livermore National Laboratory, VORL-JC-112454-Revision 1 Apr. 16, 1993.
C. H. M. van Bavel et al., Transactions American Geophysical Union, "Vertical Resolution in the Neutron Method for Measuring Soil Moisture", vol. 35, pp. 595-600, Aug. 1954.
J. W. Nyhan et al., "Spatial Resolution of Soil Water Content by Three neutron Moisture Gauges", Los Alamus National Laboratory (1983) Report No. LA-VR-83-2863.
Zero Spaced Epithermal neutron Login Empty Boreholes, Hugh E. Hall, Jr., Oct. 24-28, 1993 Proceedings of the Fifth International Symposium on Geophysics, Tulsa, Okla.

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