Treating underground formations
CA 2028221 C · Owner: Friedman, Robert Harold · Inventors: Surles, Billy Wayne; Friedman, Robert Harold
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
TREATING UNDERGROUND FORMATIONS, ABSTRACT D# 79, 250 -F, Wells penetrating oil-producing and water-producing intervals may be treated in order to reduce the flow rate of water into the well by isolating the water-producing interval and introducing into it a volume of treating fluids sufficient to invade at least six inches into the permeable formation comprising the water-producing interval. Cased wells may be treated to plug holes in the casing caused by corrosion or casing breaks by introducing a treating fluid into the formation adjacent to the break. The treating fluid comprises a material which can be acid catalyzed in a period of from 1 to 16 hours at formation conditions, preferably …
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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
- Filed October 22, 1990 and granted October 11, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 22, 2012.
- 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.