Polyamine fluid loss additive for oil well cements
CA 1206738 A · Owner: Hughes Tool Company · Inventors: Mckenzie, Lee F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aqueous cement composition is shown for cementing the annular space between a pipe and the surrounding bore in a well. The cement composition includes a hydraulic cement, water present in an amount effective to produce a pumpable slurry, a polyamine fluid loss additive and a, sulfonated polymer. By neutralizing the polyamine to a pH of approximately 7, improved free water and fluid loss properties are imparted to the system.
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 July 2, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 2, 2003.
- 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.