Liner isolation and well completion system
CA 2021518 C · Owner: Themig, Daniel Jon · Inventors: Themig, Daniel Jon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, In a wellbore having a liner hung from a higher string of pipe, a permanent packer and a seal unit are utilized to isolate the annulus between the liner and the wellbore surface. The downhole completion assembly, which comprises an on-off tool a latch and, seal assembly and a tailpipe can be lowered into the, packer and seal unit by the production tubing with the, latch mechanism of the latch and seal assembly snapping into a threaded portion of the packer. The on-off tool can be disconnected and the production tubing withdrawn from the well. Alternatively, the latch mechanism can be disengaged and the entire downhole completion assembly can be withdrawn from the well in a single …
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 July 19, 1990 and granted April 5, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 19, 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.