Method of monitoring the drilling of a borehole
CA 2020960 C · Owner: Sedco Inc. · Inventors: Booer, Anthony
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method of monitoring the drilling of a borehole through an earth formation with a rotating drill bit fixed at the lower end of a, drillstring. At least one physical quantity associated with the vibrations resulting from the interaction of the rotating drill bit with the earth formation, is detected and an oscillatory signal is generated in response thereto. Filter coefficients ak of an auto-regressive filter model are determined by fitting the filter output signal with the oscillatory signal. The reflection coefficients, of the vibrations propagating along the drill string and being reflected by a mis-match of impedance of two successive elements of the system …
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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 July 11, 1990 and granted December 25, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.