Methods and apparatus for measuring the erodability of drilling fluid deposits
CA 2120585 A1 · Owner: Halliburton Company · Inventors: Ravi, Kris M.; Beirute, Robert M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods of measuring the erodability of drilling fluid deposits and the shear stress required to remove drilling fluid deposits formed on the walls of a well bore are provided. The methods basically include introducing a drilling fluid into a test apparatus which simulates a permeable section of a well bore. Drilling fluid deposits are caused to be formed on the walls of the permeable section and, the drilling fluid is circulated through the permeable section at progressively increasing flow rates to determine the pressure drop below which no appreciable erosion of the drilling fluid deposits takes place which corresponds to the minimum shear stress required to erode the deposits. The …
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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 April 5, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 5, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 5, 2016.
- 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.