Wellbore sand control method
CA 2180758 C · Owner: Jonasson, Ralph G. · Inventors: Jonasson, Ralph G.; Perkins, Ernest H.; Rispler, Kevin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A slug of solution, comprising a linear polymer such as polysulfone polyethylene terephthalate or polyimide dissolved in a "good" solvent such as morpholine, m-cresol or dimethylsulfoxide respectively is emplaced in the near- wellbore region of an unconsolidated sand reservoir. A second slug comprising a poor solvent for the polymer such as water or water + 2-methanol is pumped into the region to contact the first slug. The linear polymer is precipitated and forms a three-dimensional network of interconnected strands extending through the fluid flow channels between the sand grains. The network functions to consolidate the sand without significantly damaging permeability.
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
- Filed July 8, 1996 and granted October 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 8, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 8, 2018.
- 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.