Device for and method of sensing conditions in a well bore

Details Device for and method of sensing conditions in a well bore Device for and method of sensing conditions in a well bore

1978-07-03

1980-09-30

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166 53, 166 65R, 166 66, 166 75R, 175 41, 73155, E21B 4704, G01N 924

Patent

active

042249880

ABSTRACT:
A device for and method of sensing conditions in a well bore by positioning a radioactive source adjacent the surface of the well bore for emitting a radioactive signal across the well bore. A means for detecting the radioactive signal is positioned opposite the radioactive source and electrical means are mounted with the detecting means for electrically measuring the intensity and frequency of occurrence of each detected signal. An electrical signal is provided by the electrical means for indicating the presence or absence of drilling fluids and/or the density of such fluids at the surface of the well bore.

REFERENCES:
patent: 2658724 (1953-11-01), Arps
patent: 2832566 (1958-04-01), Bielstein
patent: 3115576 (1963-12-01), Rickard
patent: 3324717 (1967-06-01), Brooks et al.
patent: 3334226 (1967-08-01), Buck
patent: 3529153 (1970-09-01), Zimmerman et al.
patent: 3827295 (1974-08-01), Rochon et al.
patent: 3839914 (1974-10-01), Modisette et al.

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