Process for fracturing subterranean formations
CA 1213516 A · Owner: Dowell Schlumberger Canada Inc. · Inventors: Hill, Donald G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The process of initiating and/or extending a fracture in a subterranean formation penetrated by a wellbore which comprises injecting a crosslinked aqueous gelled fracturing fluid through the wellbore and against the formation at a flow rate and pressure sufficient to initiate and/or extend a fracture in the formation is improved by including in the fracturing fluid at least one compatible, water-soluble, aliphatic cationic, polymer bearing a plurality of pendant quaternary ammonium groups. Said pendant quaternary ammonium groups are separated from the polymer backbone by at least two carbon atoms and have an ethylene -CH2CH2-, as one of the substituents chemically bonded to the nitrogen …
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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 4, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 4, 2003.
- 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.