System and methods for formation evaluation while drilling
CA 2449787 C · Owner: Prammer, Manfred G. · Inventors: Prammer, Manfred G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A logging while drilling (LWD) and measuring while drilling (MWD) method and device are disclosed for reducing the sensitivity of NMR measurements to tool motions. The invention is based on NMR relaxation measurements determining longitudinal relaxation times T1 instead of the standard T2 measurements and , involves saturating a relatively wide sensitive region of the formation and processing NMR echo signals which originale approximately from the center of the sensitive region. In another aspect the invention uses novel pulse , sequences and processing algorithms to reduce the time for the relaxation measurement and to provide real-time transfer of data uphole.
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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 June 5, 2002 and granted May 17, 2016. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2024.
- 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.