Method of recovering hydrocarbons from an underground formation
CA 1248744 A · Owner: Shell Canada Limited · Inventors: Roberts, David L.; Van Velzen, Johan F.G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To prevent dissolution of sand grains or of the original bond between these grains around a well when hot aqueous fluid is passed through the well in an oil recovery process the sand, grains are at least once treated with a solution of Co ions in a solvent such as water. Such treatment with Co ions of sand grains is also beneficial when the grains have been consolidated by means of a silicon polyhalide. Attack of the bond between the grains by formation water is then considerably decreased. EQRH04
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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 January 17, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 17, 2006.
- 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.