Method for increasing the productivity of a well penetrating an underground formation
CA 1112153 A · Owner: Shell Canada Limited · Inventors: Avison, Peter B.; Schols, Reinier S.; Van Der Vlis, Abraham C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A low-viscosity acid is injected into a fracture containing a high-viscosity fluid. The injection takes place through perforations in the casing or production tubing and the acid, follows fingering flow paths in the fracture. The perforations are widely spaced (at least 60 centimetres distance between the perforations) to prevent merging of these flow paths close to the well.
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 November 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 10, 1998.
- 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.