Process for secondary oil recovery utilizing propoxylated ethoxylated surfactants in seawater
CA 1316684 C · Owner: Conoco Inc. · Inventors: Shupe, Russell D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract A process for removing residual oil from the near wellbore area of a subterranean formation adjacent an injection well of a waterflood operation to improve water injectivity comprising injecting through said well into said area seawater containing a surfactant having the formula:, RO(CH60)7(C2H4O)2, wherein: R is a mixture of alkyl groups containing from 12 to 15 carbon atoms, Y is a sulfate group, and, X is a monovalent cation. After the treatment to improve water injectivity the, formation is waterflooded.
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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 April 27, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 27, 2010.
- 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.