Method and apparatus for detecting wear of a rotatable bit
CA 1237952 A · Owner: Exxon Production Research Company · Inventors: Davis, Albert P. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for detecting wear of a rotatable bit used to drill a wellbore is disclosed. In drilling operations a drilling fluid is pumped down through a drill stem and is discharged through ports in the drill bit and into the annulus between the drill stem and the wellbore. Excessive wear of the bit at a selected location is detected by a sensor which is linked to a restrictive device capable of reducing the flow of drilling fluid through at least one port. To detect excessive wear of the bit, at least one abradable sensor is located in the bit at a selected location. As the drill bit wears at the location, the sensor will abrade until the sensor is activated. Activation 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
- Granted June 14, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 14, 2005.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.