Well drilling system with closed circulation of gas drilling fluid and fire suppression apparatus
CA 2274169 A1 · Owner: Sprehe, Paul Robert · Inventors: Sprehe, Paul Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A well drilling system (40) for drilling with gaseous drilling fluid particularly natural gas, in a closed circulation path including an enclosure or bell nipple (42) mounted on a wellhead between the wellbore (22) and a rotary control head (84) for the system (40). The enclosure (42) redirects the flow of cuttings laden gaseous drilling fluid being circulated out of the well and includes a plurality of fire extinguishing fluid injection nozzles (92) arranged to inhibit or extinguish fire within the enclosure (42) and the rotary control head (84). Drill cuttings are separated from the gaseous drilling fluid in a pressure vessel (50) which includes separator baffles (184) and a drill …
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
- Filed December 19, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 19, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2019.
- 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.