Process of extraction of oil by means of water flooding
CA 1262820 C · Owner: Huls Aktiengesellschaft · Inventors: Balzer, Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
23443-326, Abstract, A process is disclosed for increasing the injectability of injection wells in oil extraction by means of waterflooding, by injecting a solution dispersion, or emulsion of carboxymethylated oxethylates of the formula, R - O (C3H6O)m(C2H4O)nCH2COOM in formation water or flooding water and optionally crude oil into the injection well. The surfactant is selected so -that -the phase inversion temperature of the system of reservoir oil/formation water or flooding water/tenside/ optional additives is at least 12° C above the reservoir temperature. O.Z 4090CA
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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 November 14, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 14, 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.