Controlling pressure and detecting control problems in gas-lift riser during offshore well drilling
CA 2371425 A1 · Owner: Van Acker, Torney M. · Inventors: Ehrhardt, Mark E.; Maus, L. Donald; Van Acker, Torney M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for controlling the riser base pressure and detecting well control problems, such as kicks or lost circulation during drilling of , an offshore well using a gas-lifted riser. The pressure control apparatus preferably includes two separate control elements one to adjust the pressure , at the surface (prs) and the mass flow rate out of the top of the riser (mo) to compensate for changes in riser base pressure (prb) and the other to adjust either or both of the boost mud flow rate (qb) and lift gas flow rate (qg) to maintain a constant or nearly constant mass flow rate entering the base of the riser (mi). According to the method of the present invention the well …
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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 June 1, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 1, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 1, 2022.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.