Neutron backscatter gravel pack logging sonde with azimuthal sca

Details Neutron backscatter gravel pack logging sonde with azimuthal sca Neutron backscatter gravel pack logging sonde with azimuthal sca

1993-06-04

1996-01-02

Fields, Carolyn E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250265, 2502694, G01V 510

Patent

active

054811058

ABSTRACT:
An apparatus (sonde) and method of measuring density, or gravel pack quality, in a cased well borehole using a fast neutron source and one or more thermal neutron detectors is described. In one embodiment, a neutron source creates a fast neutron flux which reacts primarily with the material within the borehole casing while a collocated neutron detector counts the number of backscattered thermal neutrons. A novel means of obtaining azimuthal measurement discrimination is provided by a rotating neutron shield. In one instance the shield is quite substantial, creating a narrow measurement window. In another instance, the shield only marginally screens the detector, creating a large measurement window. In an alternative embodiment, a second thermal neutron detector is spaced distally from the neutron source and first detector. This second detector is used to provide a measurement of the borehole's background, or environmental neutron activity, and can be used to improve the quality of the sonde's gravel pack density measurement.

REFERENCES:
patent: 2334262 (1943-11-01), Hare
patent: 4950892 (1990-08-01), Olesen
patent: 5205167 (1993-04-01), Gartner et al.
patent: 5252832 (1993-10-01), Nguyen et al.

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