Casing pack and method for controlling external well casing corrosion
CA 1248344 A · Owner: Shell Canada Limited · Inventors: Van Laar, Herman G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To prevent or minimize costly external casing corrosion it is proposed to prepare and use a casing pack comprising barium ions. As barium ions eliminate dissolved sulphate H2S and CO2, and suppress bacterial activity they impart the desired, properties of permanent stability and non-corrosiveness to the casing pack.
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
- Granted January 10, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 10, 2006.
- 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.