Ion exchange controlled chemically aided waterflood oil recovery process
CA 1091576 A · Owner: Shell Canada Limited · Inventors: Hill, Harold J.; Reisberg, Joseph; Pope, Gary A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for recovering oil by successively injecting at least a chemical slug containing an active aqueous surfactant system or thickened aqueous liquid and an aqueous drive liquid into a reservoir having a significant amount of ion exchange capacity, is improved. The ionic composition of each injected fluid is arranged to provide a ratio between, the concentration of its effectively predominate monovalent cation and the square root of the concentration of its effectively predominate divalent cation which ratio at, least substantially equals such a ratio within the aqueous fluid immediately ahead of the injected fluid.
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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 December 16, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 16, 1997.
- 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.