Nmr flow measurement while drilling
CA 2528472 C · Owner: Kraaijveld, Martin Alfred · Inventors: Kraaijveld, Martin Alfred; Appel, Matthias
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for measuring in situ formation fluid flow utilizing an NMR logging while drilling tool is disposed in the borehole a modified saturation , recovery or time of flight angiography pulse sequence is utilized to tag spins in the formation, at least two measurements are made of the tagged spins as they propagate toward the borehole in the under-balanced environment allowing , a determination of fluid velocity from which permeability may be determined. Techniques are disclosed to perform the method in both an over-balanced and under-balanced environment.
Read the whole patent
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 18, 2004 and granted April 29, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 18, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 2026.
- 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.