One-trip well perforation/proppant fracturing apparatus and methods
CA 2228415 C · Owner: Reesing, David L. · Inventors: Jackson, Alan T.; Shy, Perry C.; Reesing, David L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a subterranean well a one-trip production zone perforation and proppant fracturing operation is carried out using a workstring-supported perforation gun lowered into a casing nipple located in the production zone. Firing of the gun creates spaced apart aligned sets of perforations extending outwardly through a side wall portion of the workstring the nipple, the, surrounding cement, and into the production zone after which the gun falls intoand is retained in an underlying gun catcher portion of the workstring. While an overpull force is maintained on the workstring above the perforations a, proppant slurry is pumped down the workstring out its sidewall perforations, and outwardly through …
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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 January 30, 1998 and granted April 1, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 2020.
- 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.