Method of fracturing a subterranean formation
CA 1071531 A · Owner: The Dow Chemical Company · Inventors: Pavlich, Joseph P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fracturing method wherein (a) a viscous prop, free fluid is injected into a new or preexisting fracture to widen and extend the fracture, (b) a viscous prop carrying fluid is injected in one or more stages (c) a, viscous prop free spacer is injected (d) a low viscosity, inefficient penetrating fluid is injected all of the fore-, going being injected at rates and pressures calculated to prevent said fracture from healing, (e) injection of fluids at rates and pressures calculated to prevent said fracture from healing is ceased (including the embodiments of injecting a low viscosity penetrating fluid at a matrix rate ceasing injection entirely, flowing back the well or a, combination …
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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 February 12, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 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.