Invention Grant
US06727706B2 Virtual steering of induction tool for determination of formation dip angle 有权
用于确定地层倾角的感应工具的虚拟转向

  • Patent Title: Virtual steering of induction tool for determination of formation dip angle
  • Patent Title (中): 用于确定地层倾角的感应工具的虚拟转向
  • Application No.: US09925997
    Application Date: 2001-08-09
  • Publication No.: US06727706B2
    Publication Date: 2004-04-27
  • Inventor: Li GaoStanley C. Gianzero
  • Applicant: Li GaoStanley C. Gianzero
  • Main IPC: G01V318
  • IPC: G01V318
Virtual steering of induction tool for determination of formation dip angle
Abstract:
A method is disclosed for using a triad induction tool to identify the formation strike and dip angles. The method can be performed in real time. In one embodiment, the method includes: (1) measuring a magnetic coupling between transmitter coils and receiver coils of a tool in the borehole; (2) obtaining from the measured coupling a strike angle between the tool and the formation; (3) applying a rotational transformation to the coupling measurements to correct for the strike angle; and (4) applying a predetermined set of rotational transformations to the coupling to determine coupling term values as a function of rotation angle. A least-squares curve fit or a Hough transform of the derivative of the coupling term values with respect to position may be used to identify the dip angle.
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