Method and apparatus for eddy current suppression

Details Method and apparatus for eddy current suppression Method and apparatus for eddy current suppression

1996-03-14

1998-01-20

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Using well logging device

324323, G01V 300

Patent

active

057105111

ABSTRACT:
An electromagnetic wellbore logging tool including an elongated sonde adapted for traversing the wellbore, a source of alternating current, an antenna connected to the source of alternating current, and a receiver circuit connected to the antenna. The receiver circuit provides an output corresponding to electromagnetic signals induced in the antenna. The invention includes at least one insulating insert disposed in an annular space between the exterior of the sonde and the wall of the wellbore. The insert extends in a direction so as to segment the paths of eddy current which would otherwise flow in the annular space. In a preferred embodiment, the logging tool includes a nuclear magnetic resonance apparatus having a longitudinal dipole antenna. The insulating inserts extend along the longitudinal axis of the tool so as to segment eddy current paths perpendicular to the longitudinal axis of the tool.

REFERENCES:
patent: 4461997 (1984-07-01), Ohmer
patent: 5233304 (1993-08-01), Hubans
patent: 5280243 (1994-01-01), Miller
patent: 5451873 (1995-09-01), Freedman et al.

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