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US 10,295,631 B2Granted
Composite noise shield for magnetic resonance tools
AssigneeSchlumberger Technology Corporation
InventorsAnatoly Dementyev, Krishnamurthy Ganesan, Gabriela Leu, Nicholas Heaton
Life of this patent
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Abstract
An arrangement for shielding an NMR tool from electromagnetic noise, having a nuclear magnetic resonance tool configured to send and receive signals, a first shield configured around a nuclear magnetic resonance antenna of the nuclear magnetic resonance tool and a second shield configured to reduce the effects of eddy currents in the first shield.
Claims11
An arrangement for shielding an NMR tool from electromagnetic noise, comprising:
- a nuclear magnetic resonance (NMR) tool configured to send and receive signals, the NMR tool having an NMR antenna;
- a planar first shield positioned around the NMR antenna;
- and
- a second shield configured to reduce the effects of eddy currents in the first shield, wherein the second shield is formed of a portion of a ferrite material, the portion affixed to an inner surface of the first shield.
1 more element
An arrangement for shielding circuitry in a downhole tool from electromagnetic noise, comprising:
- a nuclear magnetic resonance tool configured to send and receive signals;
- a planar first shield configured around a nuclear magnetic resonance antenna of the nuclear magnetic resonance tool;
- and
- a second shield configured to eliminate eddy currents in the first shield, wherein the second shield is constructed from a portion of ferrite material that is in contact with an inner surface of the first shield.
1 more element
Dependencies are inferred from the claim text.