Blow-out prevention device for shutting off an annulus between a drill column and a well wall when drilling for oil or gas
CA 2108487 A1 · Owner: Norsk Hydro A.S. · Inventors: SANGESLAND, SIGBJõRN
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A blow-out prevention device (4) for shutting off a annulus (8) between a, drill column (7) and a well wall by means of an expandable sealing device, (3) when an unwanted blow-out of fluid and/or gas takes place from a geological unstable well formation when drilling, for oil or gas. When a blow-out takes place a, compressive-pulse code is activated in the inlet of the drill column (7) and is transmitted through the drilling fluid to a pressure sensor (25) which transmits the compressive-pulse code on to, the microprocessor (37) which is preprogrammed with the pressure code. If the pressure codes coincide, an electric motor (27) is activated, which, via a, set of gears (30) and a …
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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 October 15, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 15, 2015.
- 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
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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.