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

G - Physics

01

V

358/4

G01V 5/00 (2006.01)

Patent

CA 1088678

METHOD FOR DETECTING CEMENT VOIDS OR BOREHOLE WASHOUTS (D#73,367-F) ABSTRACT OF THE DISCLOSURE 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 compen- sated 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. -I-

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