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Steerable drilling system and method

  • US 7,147,066 B2
  • Filed: 08/29/2002
  • Issued: 12/12/2006
  • Est. Priority Date: 12/21/1998
  • Status: Expired due to Term
First Claim
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1. A bottom hole assembly for drilling a deviated borehole, the bottom hole assembly comprising:

  • one of a positive displacement motor and a rotary steerable device having a housing, the housing having an upper central axis;

    a rotary shaft having a portion with a lower central axis, the portion being offset with respect to the housing so as to result in an intersection of the upper central axis and the lower central axis;

    the housing containing at least a portion of the rotary shaft;

    a bit powered by the rotary shaft, the bit having a bit face defining a bit full cutting diameter; and

    a gauge section spaced above the bit face, a top of the gauge section having a diameter which is substantially the bit full cutting diameter;

    wherein an axial spacing between the bit full cutting diameter and the top of the gauge section is at least 75% of the bit full cutting diameter; and

    wherein an axial spacing along the lower central axis between the intersection and the bit face is less than twelve times the bit full cutting diameter.

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