Methods and apparatus for measuring flow velocity in a wellbore using nmr and applications using same
CA 2562217 C · Owner: Poitzsch, Martin E. · Inventors: Speier, Peter; Pop, Julian; Poitzsch, Martin E.
Overview
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Open the CIPO recordAbstract From the Canadian patent
The present invention provides methods and apparatus for determining flow velocity within a formation utilizing nuclear magnetic resonance (NMR) techniques in which the shape of the resonance region is restricted so that sensitivity to radial flow or vertical flow is obtained (or both when more than one NMR tool is used). Flow velocity using these NMR tools is determined using decay amplitude frequency displacement or stimulated echoes (where the spins are stored along the magnetic field instead of the transverse plane to exploit echo decays and frequency displacements) based on the application of adiabatic pulses. Based on the described NMR measurement of flow velocity additional wellbore …
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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 9, 2002 and granted August 7, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 9, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 9, 2024.
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