Methods and ultra-low density sealing compositions for sealing pipe in well bores
CA 2460441 A1 · Owner: Halliburton Energy Services, Inc. · Inventors: Crook, Ronald J.; Cromwell, Roger S.; Chatterji, Jiten
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides methods and ultra-low density sealing compositions for sealing pipe in well bores penetrating formations which readily fracture at low hydrostatic pressures. A method of the invention basically comprises the steps of providing a hardenable ultra-low density sealing composition comprised of an epoxide containing liquid a hardening , agent, a hardening accelerating agent a light weight filler and hollow glass michrospheres having a density in the range of from about 5 to 8.5 pounds per gallon, placing the sealing-composition in the annulus between the pipe to be sealed and the walls of the well bore and allowing the sealing composition to harden therein.
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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
- Filed January 16, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 16, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 2024.
- 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.