Method for detecting cement voids or borehole washouts

Details Method for detecting cement voids or borehole washouts Method for detecting cement voids or borehole washouts

1976-05-27

1978-05-30

Borchelt, Archie R.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250266, G01V 500

Patent

active

040925366

ABSTRACT:
A fast neutron source is used to irradiate earth formations in the vicinity of a well borehole. Dual spaced epithermal neutron detectors are used to sample the epithermal neutron population at two different spaced distances from the source. A compensated formation porosity is obtained from the ratio of counting rates at the dual spaced detectors. An uncompensated porosity value is obtained from the count rate at the short spaced detector. Borehole washout or cement void regions are located by comparing the compensated and uncompensated values of formation porosity obtained in this manner.

REFERENCES:
patent: 3823319 (1974-07-01), Tittman
patent: 3906224 (1975-09-01), Scott et al.

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