Accelerator-based methods and apparatus for measurement-while-drilling
CA 2199726 C · Owner: Roscoe, Bradley A. · Inventors: Evans, Michael L.; Holenka, Jacques M.; Couet, Benoit
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Measurement-while-drilling apparatus includes a 14 Mev neutron accelerator a , near-spaced neutron detector which primarily senses source neutrons and whose output is proportional to source strength one or more intermediately-spaced , epithermal neutron detectors eccentered against the drill collar wall and primarily responsive to formation hydrogen concentration and a third far-, spaced radiation detector either gamma ray or neutron, primarily responsive to formation density. The intermediately-spaced and far-spaced detector outputs, normalized by the near-spaced detector outputs are combined to , provide measurements of porosity density and lithology and to detect gas. A thermal …
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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 September 11, 1995 and granted November 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 11, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 11, 2017.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.