Device for guiding a drilling tool within a well and for applying a hydraulic force to said tool
CA 2034001 C · Owner: Amaudric Du Chaffaut, Benoist · Inventors: Amaudric Du Chaffaut, Benoist
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The device is interleaved in a string of drilling pipes and is provided with a drilling tool at its lower end. It is comprised of a tubular body (1) and of an outer sleeve (3) rotating about the body and longitudinally displaceable with respect to said body. Radially displaceable pistons (16) in an extension position, come into anchoring engagement in the wall of the well and immobilize the external sleeve (3). A jack (32) is used to displace the body and the drilling tool integral therewith with respect to the external sleeve and to exert thereby a pushing force onto the tool. A control assembly may without operator control the execution of a series of successive cycles of anchoring of 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 June 25, 1990 and granted April 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 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.