Apparatus and methods for drilling a wellbore using casing
CA 2725717 C · Owner: Weatherford Technology Holdings, Llc · Inventors: Galloway, Gregory G.; Giroux, Richard L.; Jackson, Raymond H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus and methods for deflecting a wellbore while drilling with casing including , a casing with a drilling member at a lower end of the casing the drilling , member having , fluid paths extending therethrough whereby an asymmetric outflow distribution is , generated through the drilling member due to a first portion of the drilling member having , more fluid paths than a second portion of the drilling member. In one method a cavity is , formed away from a central axis of the wellbore and the casing is deflected towards the , cavity. Thereafter, cement is pumped into the wellbore.
Read the whole patent
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 February 2, 2004 and granted April 15, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 2, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 2, 2026.
- 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.