Method of thermally insulating a wellbore
CA 2249896 A1 · Owner: Wyant, Reece Eugene · Inventors: Nahm, James Jang Woo; Wyant, Reece Eugene
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a method for insulating an annulus surrounding a tubular in a wellbore comprising filling the annulus with an emulsion of liquid sodium silicate and an acid forming agent, increasing a temperature in the annulus, and forming a silica gel in the annulus the silica gel effective in insulating the annulus. Said annulus may be formed between a well casing and a steam injection tubing within the casing and is filled with the emulsion.
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 October 9, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 9, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 9, 2020.
- 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.