Microcoil NMR for downhole microfluidics platform
First Claim
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1. A downhole tool for a fluid, the downhole tool comprising:
- a nuclear magnetic resonance (NMR) device that comprises;
a micro tube for containing the fluid;
at least one magnet configured to apply a static magnetic field to at least a portion of the fluid within the micro tube, wherein the at least one magnet comprises at least two magnets that each apply different magnetic field strengths along the micro tube; and
at least one coil coupled to a tuning circuit and configured to apply radio frequency (RF) pulses to the portion of the fluid within the micro tube, wherein the coil and circuit are tuned to a Larmor frequency that corresponds to the static magnetic field applied by the at least one magnet.
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Abstract
Methods and related apparatuses of a downhole micro nuclear magnetic resonance (NMR) device having a resonant tuning (LC) circuit for use in a formation for collecting NMR signals from a fluid in the formation while under downhole pressures and temperatures. The downhole micro NMR device includes: a micro tube for the flowing fluid to flow therethrough; at least one magnet disposed about the micro tube; and at least one micro RF coil structured and arranged approximate to the micro tube and tuned to a Larmor frequency corresponding to a applied magnetic field from the at least one magnet.
17 Citations
35 Claims
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1. A downhole tool for a fluid, the downhole tool comprising:
a nuclear magnetic resonance (NMR) device that comprises; a micro tube for containing the fluid; at least one magnet configured to apply a static magnetic field to at least a portion of the fluid within the micro tube, wherein the at least one magnet comprises at least two magnets that each apply different magnetic field strengths along the micro tube; and at least one coil coupled to a tuning circuit and configured to apply radio frequency (RF) pulses to the portion of the fluid within the micro tube, wherein the coil and circuit are tuned to a Larmor frequency that corresponds to the static magnetic field applied by the at least one magnet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for making a downhole nuclear magnetic resonance (NMR) measurement of a fluid using a NMR device, the method comprising:
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flowing the fluid into a micro tube of the NMR device; applying a static magnetic field to at least a portion of the fluid within the micro tube; wherein applying the static magnetic field comprises applying to the fluid two spatially separate static magnetic fields having different magnetic field strengths; applying radio frequency (RF) pulses to the portion of the fluid within the micro tube; detecting magnetic resonance signals generated within the fluid; and analyzing the detected magnetic resonance signals to extract information about the fluid. - View Dependent Claims (31, 32, 33, 34, 35)
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Specification