Method and apparatus for use in creating a magnetic...

Details Method and apparatus for use in creating a magnetic... Method and apparatus for use in creating a magnetic...

G - Physics

01

V

G01V 3/26 (2006.01) E21B 47/022 (2006.01)

Patent

CA 2291545

A method and apparatus for use in creating a magnetic declination profile for a borehole. The method includes the steps of making a magnetic directional measurement at a longitudinal location in the borehole and at a magnetic measurement orientation, making a reference directional measurement at a reference measurement orientation, wherein there is a known orientation relationship between the magnetic measurement orientation and the reference measurement orientation, and obtaining a value of magnetic declination at the longitudinal location in the borehole using the magnetic directional measurement, the reference directional measurement and the orientation relationship. The apparatus includes a magnetic instrument for making a magnetic directional measurement, a magnetic orientation calibration indicator associated with the magnetic instrument for providing a magnetic instrument calibration orientation, a reference instrument linked with the magnetic instrument for making a reference directional measurement and a reference orientation calibration indicator associated with the reference instrument for providing a reference instrument calibration orientation.

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