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Dynamic orienting reference system for directional drilling

  • US 6,192,748 B1
  • Filed: 10/30/1998
  • Issued: 02/27/2001
  • Est. Priority Date: 10/30/1998
  • Status: Expired due to Fees
First Claim
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1. An apparatus for drilling an initial portion of a sidetracked wellbore from a well having a sidetrack opening in a casing, comprising:

  • a whipstock adapted to be landed in the casing and having an inclined surface and at least one magnet positioned on the inclined surface, the whipstock adapted to be oriented to place the inclined surface facing in a desired direction;

    a drill string adapted to be lowered into the casing and into engagement with the inclined surface;

    a drill bit assembly on a lower end of the drill string for drilling the sidetracked wellbore through the opening; and

    an instrument carried in the drill string having a magnetic sensor for detecting the magnet, the sensor having a preset alignment with the drill bit assembly, the sensor being shielded so that it will detect the magnet only when the instrument is rotated into general alignment with the magnet, the instrument providing a signal to the surface regarding orientation of the sensor relative to the magnet to enable steering of the drill bit assembly during drilling.

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