Method of remedial cement squeezing using phenolic-aldehyde gels
CA 1324753 C · Owner: Strilchuk, Andrew R. · Inventors: Nagra, Surjit Singh; Strilchuk, Andrew R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method is disclosed for remedial cementing operations. A two-stage process is provided wherein a phenolic-aldehyde gelling solution is injected into an area wherein remedial cementing is to be performed to form a gel near the wellbore and cement is sequentially squeezed into the area. This method is useful to seal and thereby prevent loss of cement in fractured, vuggy or highly permeable zones as well as to block small channels in cement behind casing.
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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 November 30, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 30, 2010.
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Timeline
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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.