A method of scale dissolution in a formation containing multiple productive intervals
CA 2174770 A1 · Owner: Mobil Oil Corporation · Inventors: Fieler, Eleanor Roth; Paul, James Mark; Jennings, Alfred Roy, Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method to improve the efficiency of scale dissolution in a formation containing multiple productive intervals (20, 22, 24, 26) where variable density liquids are utilized. Initially, a liquid composition sufficient to solubilize an alkaline-earth metal sulphate scale deposit is directed into a wellbore (10) thereby contacting scale in one productive interval of the formation. Thereafter, a second scale solubilizing liquid having a density less than the first liquid is directed into the wellbore (10) thereby contacting additional perforations (14) and a higher interval. These scale solubilizing liquids with varying densities are allowed to remain in contact with perforations (14) and …
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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 December 8, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2016.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.