Logging while drilling tool with azimuthal sensistivity

Details Logging while drilling tool with azimuthal sensistivity Logging while drilling tool with azimuthal sensistivity

1997-03-06

1999-04-06

Eldred, J. Woodrow

Communications: electrical

Wellbore telemetering or control

Including particular sensor

324342, 324346, G01V 300

Patent

active

058924604

ABSTRACT:
An azimuthally sensitive LWD tool is disclosed, comprising a transmitting antenna, a receiving antenna, wherein the receiving antenna is azimuthally focused so as to be more sensitive to changes in magnetic flux in a particular azimuthal segment of the antenna and means for measuring current induced in the receiving antenna as a result of current flowing through said transmitting antenna.

REFERENCES:
patent: 4712070 (1987-12-01), Clark et al.
patent: 4786874 (1988-11-01), Grosso et al.
patent: 5045795 (1991-09-01), Gianzero et al.
patent: 5530358 (1996-06-01), Wisler et al.
patent: 5654639 (1997-08-01), Locatelli et al.

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