G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 3/14 (2006.01) E21B 49/08 (2006.01) G01N 24/08 (2006.01) G01R 33/44 (2006.01) G01V 3/32 (2006.01)
Patent
CA 2455466
The present invention discloses a method and apparatus to make a nuclear magnetic resonance measurement on a flowing fluid using varied wait times. In one method, NMR measurements are made by: a) flowing the fluid through a static magnetic field; b) applying a group of oscillating magnetic field pulses to the flowing fluid, wherein the group of pulses is comprised of an initial pulse and one or more refocusing pulses; c) detecting magnetic resonance signals from the flowing fluid; d) after a wait time, repeating (b) and (c) one or more times, wherein at least two of the repetitions have varied wait times; and e) analyzing the detected magnetic resonance signals to extract information about the flowing fluid. Further, varied wait time measurements may be useful in determining the flow rate of the sample.
Freedman Robert
Gaylor Richard W.
Kleinberg Robert L.
Madio David P.
Schlumberger Canada Limited
Smart & Biggar
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