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Rotary steerable drilling tool and associated method of use

  • US 6,892,830 B2
  • Filed: 04/08/2003
  • Issued: 05/17/2005
  • Est. Priority Date: 11/03/2000
  • Status: Expired due to Term
First Claim
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1. A rotary steerable drilling tool, comprising:

  • (a) a mandrel;

    (b) a housing mounted on the mandrel for rotation in relation to the mandrel; and

    (c) an adjustable offset mechanism on the housing, the adjustable offset mechanism being surface adjustable to move the rotary steerable drilling tool to and from a straight ahead drilling position and an offset drilling position;

    (d) a first sensor on the mandrel that is sensitive to a rotary orientation of the housing, the first sensor providing a signal indicative of the rotary orientation of the housing on the mandrel, for use in controlling the rotary steerable drilling tool;

    (e) a second sensor on the mandrel, the second sensor being longitudinally offset from the first sensor;

    (f) the first sensor being sensitive to the rotary orientation of the housing in relation to the mandrel when the rotary steerable drilling tool is an on-bottom drilling position; and

    (g) the second sensor being sensitive to the rotary orientation of the housing in relation to the mandrel when the rotary steerable drilling tool is in a pulled back position.

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