Detecting outflow or inflow of fluid in a wellbore
CA 2047587 A1 · Owner: Oosterling, Peter · Inventors: Worrall, Robert Nicholas; Oosterling, Peter; Surewaard, Johannes Henricus Gerardus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for detecting outflow of fluid from an offshore wellbore (5) to a surrounding earth formation (7) or inflow of fluid from the formation (7) to the wellbore (5) said wellbore (5), being in fluid communication with a conduit (13) extending between the wellbore (5) and an offshore structure (1) floating above the wellbore (5). The wellbore (5) and the conduit (13) are at least partly filled with a body of fluid (82). A first stream of liquid is inserted into the body of fluid (82) and a second stream of liquid is discharged therefrom. The flowrates of said streams of liquid and a variation of the fluid content of the body of fluid (82) are determined. (Figure 1), caupd4:t5561ff vm2
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 July 23, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 2013.
- 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.