Single riser with two wellheads
CA 2273101 A1 · Owner: Bridges, Charles D. · Inventors: Bridges, Charles D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A guidance system comprising two guide tubes (13 15) are lowered into a well , with a conductor (11). The guide tubes (13 15) are connected together by , partitions (17) which divide the conductor into two halves. Each partition (17) comprises two symmetrical half sections facing in opposite directions. The operator lowers a string of drill pipe (25) into the conductor to drill a first smaller diameter well at the bottom of the conductor. After drilling to the desired depth, the operator runs a first string of casing (29) down the conductor and through the new well bore. The casing (29 31) is located on one , side of each partition (17) and cemented in place. The operator then lowers …
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 4, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 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.