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Method and apparatus for enhancing directional accuracy and control using bottomhole assembly bending measurements

  • US 7,503,403 B2
  • Filed: 12/17/2004
  • Issued: 03/17/2009
  • Est. Priority Date: 12/19/2003
  • Status: Expired due to Fees
First Claim
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1. A method for drilling a wellbore, comprising:

  • extending a bottomhole assembly into the wellbore;

    measuring a bending moment M at at least one axial location along the bottomhole assembly; and

    estimating a dog leg severity of the wellbore using
    δ

    =(

    M
    )/(

    I
    ),where M is the measured bending moment, E is the Young'"'"'s modulus for the bottomhole assembly, I is the moment of inertia of the bottomhole assembly, and k is a conversion factor.

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