Motion compensation apparatus and method of gyroscopic instruments for determining heading of a borehole
CA 2131576 C · Owner: Schlumberger Canada Limited · Inventors: Moulin, Pierre A.; Phillips, Wayne J.; Hache, Jean-Michel D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus is disclosed for measuring motion signals of gyroscopes in downhole instruments used to determine the heading of a borehole. An illustrative, embodiment of the invention includes a measuring-while-drilling system which may, experience motion even while the drill string is suspended in rotary table slips when the, heading of the drill string is being determined. Accelerometer and magnetometer data, along three orthogonal axes of a measurement sub are used to obtain unit gravitational, vectors ~ at a first time and at a second time and unit magnetic vectors ~ at the first time, and the second time. The difference between the two unit gravitational vectors at the, …
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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 September 7, 1994 and granted August 1, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 7, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 7, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.