High temperature guar based fracturing fluid
CA 1280588 C · Owner: Dowell Schlumberger Canada Inc. · Inventors: Hodge, Richard Myers; England, Kevin Wayne; Brannon, Harold Dean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fracturing fluid based on quar gum exhibiting good viscosity and stability at temperatures from about 80°C to at least about 120°C. The fracturing fluid includes a guar gum a zirconium or hafnium cross-linking agent and a bicarbonate, salt in an aqueous solution at a pH from about 8 to about 10.
Read the whole patent
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 26, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 26, 2008.
- 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.