NMR-LWD IMAGING TOOL
First Claim
1. An apparatus for estimating a nuclear magnetic resonance (NMR) property of an earth formation penetrated by a borehole, the apparatus comprising:
- a logging tool;
a source of a static magnetic field, the source being disposed at the logging tool and configured to polarize a region of investigation in the earth formation;
a transmitter antenna disposed at the logging tool and configured to transmit electromagnetic energy into the region of investigation;
at least one receiver sensor disposed at the logging tool and configured to receive NMR signals from the region of investigation in response to an interaction between the static magnetic field and the transmitted electromagnetic energy; and
a processor configured to;
receive the NMR signals from the at least one receiver sensor;
associate the NMR signals received from the at least one receiver sensor with an azimuthal direction at which the NMR signals were received; and
estimate the property from the NMR signals and the associated azimuthal directions.
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Accused Products
Abstract
An apparatus for estimating a nuclear magnetic resonance (NMR) property of an earth formation penetrated by a borehole, the apparatus including: a logging tool having a source of a static magnetic field configured to polarize a region of investigation in the earth formation; a transmitter antenna disposed at the logging tool and configured to transmit electromagnetic energy into the region of investigation; at least one receiver sensor disposed at the logging tool and configured to receive NMR signals from the region of investigation in response to an interaction between the static magnetic field and the transmitted electromagnetic energy; and a processor configured to: receive the NMR signals from the at least one receiver sensor; associate the NMR signals received from the at least one receiver sensor with an azimuthal direction at which the NMR signals were received; and estimate the property from the NMR signals and the associated azimuthal directions.
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Citations
21 Claims
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1. An apparatus for estimating a nuclear magnetic resonance (NMR) property of an earth formation penetrated by a borehole, the apparatus comprising:
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a logging tool; a source of a static magnetic field, the source being disposed at the logging tool and configured to polarize a region of investigation in the earth formation; a transmitter antenna disposed at the logging tool and configured to transmit electromagnetic energy into the region of investigation; at least one receiver sensor disposed at the logging tool and configured to receive NMR signals from the region of investigation in response to an interaction between the static magnetic field and the transmitted electromagnetic energy; and a processor configured to; receive the NMR signals from the at least one receiver sensor; associate the NMR signals received from the at least one receiver sensor with an azimuthal direction at which the NMR signals were received; and estimate the property from the NMR signals and the associated azimuthal directions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for estimating a nuclear magnetic resonance (NMR) property of an earth formation penetrated by a borehole, the method comprising:
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conveying a logging tool through the borehole; generating a static magnetic field in a region of investigation in the earth formation with the logging tool; transmitting electromagnetic energy into the region of investigation with the logging tool; receiving NMR signals with at least one receiver sensor disposed at the logging tool from the region of investigation in response to an interaction between NMR spins and the static magnetic field and the transmitted electromagnetic energy; associating the NMR signals received from the at least one receiver sensor with an azimuthal direction at which the NMR signals were received; and estimating the property from the NMR signals and the associated azimuthal directions. - View Dependent Claims (18, 19, 20)
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21. A machine-readable medium comprising machine-executable instructions for estimating a nuclear magnetic resonance (NMR) property of an earth formation penetrated by a borehole by implementing a method comprising:
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receiving NMR signals with at least one receiver sensor from a region of investigation in the earth formation; associating the NMR signals received from the at least one receiver sensor with an azimuthal direction at which the NMR signals were received; and estimating the property from the NMR signals and the associated azimuthal directions.
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Specification