Method and apparatus for use in creating a magnetic declination profile for a borehole
CA 2291545 C · Owner: Halliburton Energy Services, Inc. · Inventors: Bond, Bruce John
Overview
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Open the CIPO recordAbstract From the Canadian patent
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 …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 3, 1999 and granted February 4, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2021.
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