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
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Application No.: US09925997Application Date: 2001-08-09
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Publication No.: US06727706B2Publication Date: 2004-04-27
- Inventor: Li Gao , Stanley C. Gianzero
- Applicant: Li Gao , Stanley C. Gianzero
- Main IPC: G01V318
- IPC: G01V318

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.
Public/Granted literature
- US20030030439A1 Virtual steering of induction tool for determination of formation DIP angle Public/Granted day:2003-02-13
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