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US 8,471,559 B2Granted
Downhole micro magnetic resonance analyzer
AssigneeSchlumberger Technology Corporation
InventorsReza Taherian, Krishnamurthy Ganesan, Robert Freedman
Life of this patent
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Abstract
A downhole micro MR analyzer for use in a wellbore, having a micro sample tube, a micro RF coil in close proximity to the micro sample tube, and one or more magnets disposed about the micro sample tube is disclosed. The micro MR analyzer can be used for nuclear magnetic resonance or electron spin resonance experiments to ascertain formation properties and chemical compositions.
Claims19
A downhole micro MR analyzer comprising:
- a micro sample tube connected to a downhole wellbore sampling tube, the micro sample tube comprises
- a substrate having a passageway formed therein for transporting a reservoir fluid;
- a micro RF coil in close proximity to the micro sample tube wherein at least a portion of the coil is etched directly onto the micro sample tube;
- and
- one or more magnets micro-fabricated by constructing at least one of the magnets directly on the substrate comprising the micro sample tube, the one or more magnets generating a magnetic field into the micro sample tube.
2 more elements
A downhole micro MR analyzer system comprising:
- a micro RF coil;
- a micro-strip line with a first conductive trace on a dielectric material mounted onto a second conductive trace;
- a slit through the micro strip line forming a micro sample tube;
- and
- a magnet disposed about the micro sample tube, with the micro sample tube connected to a downhole wellbore sampling tool in order to transport reservoir fluid through the analyzer system.
2 more elements
A method to perform a MR experiment in a wellbore, comprising:
- sampling a reservoir fluid with a downhole wellbore sampling device;
- transporting the reservoir fluid to a downhole micro MR analyzer in the wellbore, the downhole micro MR analyzer comprising:
- a micro sample tube;
- a micro RF coil in close proximity to the micro sample tube, the micro RF coil etched on a printed circuit board and attached to the micro sample tube;
- and
- one or more magnets disposed about the micro sample tube in order to generate a magnetic field within the micro sample tube;
- obtaining a portion of the reservoir fluid in the micro sample tube;
- polarizing the portion of the reservoir fluid with the one or more magnets;
- irradiating the portion of the reservoir fluid sample with RF signal from the micro RF coil;
- and
- measuring the MR response from the portion of the reservoir fluid in order to ascertain properties of the wellbore, formation about the wellbore or the fluid sample.
8 more elements
Dependencies are inferred from the claim text.