Apparatus for microinductive investigation of earth formations

Details Apparatus for microinductive investigation of earth formations Apparatus for microinductive investigation of earth formations

G - Physics

01

V

324/9

G01V 3/28 (2006.01)

Patent

CA 1243076

ABSTRACT OF THE DISCLOSURE A wall-engaging apparatus for microinductively investigating a charac- teristic of earth formation traversed by a borehole includes an antenna set mounted in a longitudinally elongated body adapted for a sliding engagement with the wall of the borehole. The antenna set includes a first antenna element, a second antenna element, and a third antenna element; the respective locations and orientations of the second and third antenna elements being selected to place the second and third antenna elements in electromagnetic symmetry relative to the first antenna ele- ment. Means are included for differentially coupling the second and third antenna elements. Either the first antenna element or the differentially-coupled second and third antenna elements may be energized by suitable means, while the other is cou- pled to means for receiving signals indicative of the characteristic.

477600

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