Weight and pressure operated well testing apparatus and its method of operation
CA 1061245 A · Owner: Halliburton Company · Inventors: Barrington, Burchus Q.; Hortman, Norman G.; Farley, David L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of operating a valve in a testing string having a flow channel therethrough and located in a fluid filled well bore, comprising the steps of: providing a sealed chamber in the testing string; creating a pressure differential between the pressure in the sealed chamber and fluid pressure in the well bore, wherein the pressure in the sealed chamber is independent of the pressure in the flow passage of the testing string, applying weight in the testing string onto an operating mandrel means in the testing string, thereby moving the operating mandrel means in a first direction increasing the fluid, pressure in the well bore by a predetermined amount thereby, increasing the pressure …
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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 August 28, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 28, 1996.
- 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.