Alkoxylated surfactant system for heavy oil reservoirs
CA 2052006 A1 · Owner: Prukop, Gabriel · Inventors: Prukop, Gabriel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
ALKOXYLATED SURFACTANT SYSTEM FOR HEAVY OIL RESERVOIRS (D#79,033-F), ABSTRACT OF THE DISCLOSURE The invention is a method of recovering heavy oil from an underground reservoir by surfactant flooding which comprises injecting an aqueous surfactant solution comprising about 0.1% to about 5% by weight of an alkoxylated nonionic or ionic surfactant through an injection well into an underground reservoir containing a heavy oil having an average API gravity below about 20° and a reservoir temperature above about 150°F where the, alkoxylated surfactant must have sufficient alkylene oxide groups comprised of ethylene oxide or propylene oxide to have a cloud point above about 100°F and below …
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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
- Filed September 23, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 23, 2013.
- 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.