Steerable magnetic dipole antenna for...

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G - Physics

01

R

G01R 33/02 (2006.01) E21B 47/12 (2006.01) H01F 5/00 (2006.01) H01Q 1/04 (2006.01) H01Q 7/00 (2006.01) G01V 3/26 (2006.01)

Patent

CA 2715881

A steerable or non-steerable, magnetic dipole antenna for Measurement-While--Drilling (MWD) or Logging-While-Drilling (LWD) applications. The antenna elements use a hole arrangement in addition to grooves in a steel tool body, which is typically a drill collar. This antenna embodiment is extremely robust, meaning that does not significantly reduce the structural integrity of the tool body in which it is disposed. The antenna embodiment is also relatively wear resistant. The resultant magnetic dipole generated by this antenna is also electrically steerable in inclination angle from a common origin. A variable dipole moment inclination angle combined with independently measured tool rotation orientation during normal drilling allows the antenna to generate a magnetic dipole moment that may be directed at any three dimensional angle and from a common origin point at the centroid of the antenna. The antenna can also be embodied to be more sensitive to resitivity in a particular azimuthal direction.

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