Apparatus for measuring the diameter of a borehole

Details Apparatus for measuring the diameter of a borehole Apparatus for measuring the diameter of a borehole

1981-08-05

1983-10-04

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

33178F, 33DIG5, E21B 4900

Patent

active

044071574

ABSTRACT:
A well logging instrument has a plurality of contact arms which are forced against the sidewall of the borehole. The contact arms are pivotally attached to a first collar fixed to a central shaft and are pivotally attached to a second collar slidably mounted on the central shaft. Radial movement of the center of the contact arms moves a slidable collar member over an electrical coil assembly emitting an alternating magnetic flux field. The movement of the slidable collar over the electrical coil assembly alters the eddy current loading of a coil. The position of the contact arms and thus the position of the slidable collar attached thereto can be measured by detecting the eddy current loading of the coil.

REFERENCES:
patent: 2640271 (1953-06-01), Boucher
patent: 3977468 (1976-08-01), Brewer et al.
patent: 4205266 (1980-05-01), Lichtenberg

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