Measurement tool for obtaining tool face on a rotating drill collar
First Claim
Patent Images
1. A borehole imaging tool comprising:
- a tool body configured for rotating with a drill string in a subterranean borehole;
at least one magnetoresistive magnetic field sensor deployed in the tool body, the sensor disposed to measure first and second cross axial components of a magnetic field in the subterranean borehole;
an electrical transmission path for conducting electrical power from one longitudinal end of the tool to another longitudinal end thereof, the transmission path including an electrically conductive, non-magnetic tube, the conductive tube deployed in the tool body, the at least one magnetoresistive magnetic field sensor deployed in the conductive tube; and
a programmed processor communicatively coupled with the at least one magnetoresistive magnetic field sensor, the programmed processor configured to (i) calculate tool face angles in substantially real time from the cross axial components of the magnetic field, (ii) receive logging while drilling data from a logging while drilling sensor, and (iii) correlate the logging while drilling data and the tool face angles into a set of corresponding data pairs.
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Abstract
An apparatus for obtaining tool face angles on a rotating drill collar in substantially real time is disclosed. In one exemplary embodiment the apparatus includes a magnetoresistive magnetic field sensor deployed in a tool body. The apparatus further includes a programmed processor configured to calculate tool face angles in substantially real time from the magnetic field measurements. The programmed processor may optionally further be configured to correlate the calculated tool face angles with logging while drilling measurements for use in borehole imaging applications.
133 Citations
32 Claims
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1. A borehole imaging tool comprising:
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a tool body configured for rotating with a drill string in a subterranean borehole; at least one magnetoresistive magnetic field sensor deployed in the tool body, the sensor disposed to measure first and second cross axial components of a magnetic field in the subterranean borehole; an electrical transmission path for conducting electrical power from one longitudinal end of the tool to another longitudinal end thereof, the transmission path including an electrically conductive, non-magnetic tube, the conductive tube deployed in the tool body, the at least one magnetoresistive magnetic field sensor deployed in the conductive tube; and a programmed processor communicatively coupled with the at least one magnetoresistive magnetic field sensor, the programmed processor configured to (i) calculate tool face angles in substantially real time from the cross axial components of the magnetic field, (ii) receive logging while drilling data from a logging while drilling sensor, and (iii) correlate the logging while drilling data and the tool face angles into a set of corresponding data pairs. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A borehole imaging tool comprising:
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a tool body configured for rotating with a drill string in a subterranean borehole; at least one magnetoresistive magnetic field sensor deployed in the tool body, the at least one magnetoresistive magnetic field sensor disposed to measure first and second cross axial components of a magnetic field in the subterranean borehole; an electrical transmission path for conducting electrical power from one longitudinal end of the tool to another longitudinal end thereof, the transmission path including an electrically conductive, non-magnetic tube, the conductive tube deployed in the tool body, the magnetoresistive magnetic field sensor deployed in the conductive tube; at least one logging while drilling sensor deployed in the tool body, the at least one logging while drilling sensor disposed to make formation property measurements in the subterranean borehole; and a programmed processor communicatively coupled with the at least one magnetoresistive magnetic field sensor and the at least one logging while drilling sensor, the programmed processor configured to calculate tool face angles of the at least one logging while drilling sensor in substantially real time from the cross axial components of the magnetic field. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A downhole measurement tool comprising:
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a tool body configured to be operatively coupled with a drill string and deployed in a subterranean borehole; an electrical transmission path for conducting electrical power from one longitudinal end of the tool to another longitudinal end thereof, the transmission path including an electrically conductive, non-magnetic tube, the conductive tube deployed in the tool body; and at least one magnetic field sensor deployed in the conductive tube. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A downhole measurement tool comprising:
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a tool body configured for rotating with a drill string in a subterranean borehole; an electrical transmission path for conducting electrical power from one longitudinal end of the tool to another longitudinal end thereof, the transmission path including an electrically conductive, non-magnetic tube, the conductive tube deployed in the tool body; at least one magnetic field sensor deployed in the conductive tube, the sensor disposed to measure first and second cross axial components of a magnetic field in the subterranean borehole; and a programmed processor communicatively coupled with the at least one magnetic field sensor, the programmed processor configured to calculate tool face angles in substantially real time from the cross axial components of the magnetic field. - View Dependent Claims (25, 26, 27)
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28. A string of downhole tools comprising:
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an electrical power sub; a logging while drilling tool including at least one logging while drilling sensor, the at least one logging while drilling sensor disposed to make formation property measurements in a subterranean borehole; and a borehole imaging tool deployed between the electric power sub and the logging while drilling tool, the borehole imaging tool including; a tool body; an electrical transmission path for conducting electrical power from the electrical power sub to the logging while drilling tool, the transmission path including an electrically conductive, non-magnetic tube, the conductive tube deployed in the tool body; at least one magnetic field sensor deployed in the conductive tube, the magnetic field sensor disposed to measure first and second cross axial components of a magnetic field adjacent a subterranean borehole; and a programmed processor communicatively coupled with the at least one magnetic field sensor, the programmed processor configured to calculate tool face angles of the at least one logging while drilling sensor in substantially real time from the cross axial components of the magnetic field and correlate the logging while drilling formation property measurements and the tool face angles into a set of corresponding data pairs. - View Dependent Claims (29, 30, 31, 32)
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Specification