Well drilling method and drilling fluid
CA 2463466 A1 · Owner: Croda International Plc · Inventors: Grainger, Neil; Audibert Hayet, Annie; White, Mark
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a well drilling method consisting in removing the drilling cuttings using an aqueous drilling fluid such as a foam including a foaming agent which is or includes, at least one mono-(aliphatic hydrocarbyl) phosphate ester. More specifically the drilling fluid takes the form of a potassium and/or alkanolamine and/or alkylalkanolamine salt said foam also comprising a foam stabiliser.
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 October 14, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 14, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 14, 2024.
- 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.