Steam-foaming surfactant mixtures which are tolerant of divalent ions
CA 1259475 A · Owner: Shell Canada Limited · Inventors: Owens, Kenneth B.; Dilgren, Richard E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a steam-foam-displacement of oil within a reservoir formation having a significant ion-exchange capacity for releasing multivalent cations, the rate of the steam foam propagation is increased by injecting a mixture of steam and a steam-foaming surfactant mixture comprising an independently effective steamfoaming sulphonate surfactant mixed with a lesser amount of an alkyl or alkylarylpolyalkoxyalkylene sulphonate cosurfactant.
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
- Granted September 19, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 19, 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.