System for Measuring Stress in Downhole Tubulars
First Claim
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1. An apparatus for determining an azimuthal stress variation in a tubular within a borehole, the apparatus comprising:
- a logging tool including at least one transducer configured to generate a wave in the tubular;
a plurality of receivers azimuthally distributed in the logging tool, each of the receivers configured to produce a signal responsive to the generated wave and an azimuthal stress distribution in the tubular; and
at least one processor configured to determine from the signal from each of the plurality of receivers an indication of the azimuthal stress distribution in the tubular.
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Abstract
An apparatus for evaluating the possibility of casing failure in a borehole measures azimuthal changes in a property responsive to azimuthal changes in axial stress. The measurements may be of acoustic velocity, magnetic permeability, and Barkhausen noise.
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Citations
22 Claims
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1. An apparatus for determining an azimuthal stress variation in a tubular within a borehole, the apparatus comprising:
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a logging tool including at least one transducer configured to generate a wave in the tubular; a plurality of receivers azimuthally distributed in the logging tool, each of the receivers configured to produce a signal responsive to the generated wave and an azimuthal stress distribution in the tubular; and at least one processor configured to determine from the signal from each of the plurality of receivers an indication of the azimuthal stress distribution in the tubular. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10)
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3. The apparatus of clam 1 wherein each of the plurality of receivers further comprises an electromagnetic receiver mounted on a pad extendable from a body of the logging tool and wherein the signal produced by each of the plurality of receivers is indicative of a magnetic permeability of the tubular.
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11. A method of determining an azimuthal stress variation in a tubular within a borehole, the method comprising:
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using at least one transducer on a logging tool for generating a wave in the tubular; using each of a plurality of receivers azimuthally distributed on the logging tool for producing a signal responsive to the generated wave and an azimuthal stress distribution in the tubular; and determining from the signal from each of the plurality of receivers an indication of the azimuthal stress distribution in the tubular. - View Dependent Claims (12, 14, 15, 16, 17, 18, 19, 20)
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13. The method of clam 11 further comprising using, for each of the plurality of receivers, an electromagnetic receiver mounted on a pad extendable from a body of the logging tool and wherein the signal produced by each of the plurality of receivers is indicative of a magnetic permeability of the tubular.
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21. A computer-readable medium for use with an apparatus for identifying a torsional stress a tubular within a borehole, the apparatus comprising:
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at least one transducer on a logging tool configured to generate a wave in the tubular; a plurality of receivers azimuthally distributed on the logging tool, each of the plurality of receivers configured to produce a signal responsive to the generated wave and an azimuthal stress distribution in the tubular; and the medium comprising instructions that enable at least one processor to determine from the signal from each of the plurality of receivers an indication of the azimuthal stress distribution in the tubular. - View Dependent Claims (22)
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Specification