Method of abandoning a well and apparatus therefor
CA 2126289 A1 · Owner: Head, Philip Frederick · Inventors: Head, Philip Frederick
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 abandoning a well which has ceased to provide economic use. The method includes pressurising the well fluids through the production tubing including optionally additional adjacent annular channels to force them back into the reservoir by means of a gaseous medium such as nitrogen. Then sealing the production tubing and optional annular channels with a suitable seal. Draining the remaining channels by perforation into the void in the production tubing and optional channels formed by the gaseous medium. Followed by a final sealing of the whole well. 21
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 June 20, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 20, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 2016.
- 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.