Magnetic field sensing tool with magnetic flux concentrating blocks
First Claim
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1. A downhole magnetic field sensing tool comprising:
- a rotatable cylindrical tubular member having an internal bore formed therethrough;
a first magnetic field sensor having a first measurement axis, a second magnetic field sensor having a second measurement axis and a third magnetic field sensor having a third measurement axis, each magnetic field sensor disposed within the internal bore of the rotatable cylindrical tubular member, wherein the first measurement axis, the second measurement axis, and the third measurement axis each makes an angle with a central axis of the rotatable cylindrical tubular member and the first measurement axis is arranged at a non-zero angle relative to the second measurement axis, each magnetic field sensor employing a magnetically permeable core, the magnetically permeable core having a first axial end and a second axial end;
a first magnetic flux concentrating block and a second magnetic flux concentrating block wherein the first magnetic flux concentrating block is disposed within the internal bore at the first axial end of the magnetically permeable core of each magnetic field sensor, and the second magnetic flux concentrating block is disposed within the internal bore at the second axial end of the magnetically permeable core of each magnetic field sensor; and
an electronics unit operatively and communicatively connected to each magnetic field sensor.
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Abstract
A magnetometer includes a sensor housing having an internal bore formed therethrough and a magnetic field sensor disposed within the internal bore of the sensor housing. The magnetic field sensor is fixedly mounted within the internal bore of the sensor housing. A magnetic flux concentrating block is disposed proximate to an end of the at least one magnetic field sensor. An electronics unit is disposed within the internal bore of the sensor housing and is operatively and communicatively connected to the magnetic field sensor. The electronics unit is configured to receive a signal from the magnetic field sensor.
18 Citations
17 Claims
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1. A downhole magnetic field sensing tool comprising:
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a rotatable cylindrical tubular member having an internal bore formed therethrough; a first magnetic field sensor having a first measurement axis, a second magnetic field sensor having a second measurement axis and a third magnetic field sensor having a third measurement axis, each magnetic field sensor disposed within the internal bore of the rotatable cylindrical tubular member, wherein the first measurement axis, the second measurement axis, and the third measurement axis each makes an angle with a central axis of the rotatable cylindrical tubular member and the first measurement axis is arranged at a non-zero angle relative to the second measurement axis, each magnetic field sensor employing a magnetically permeable core, the magnetically permeable core having a first axial end and a second axial end; a first magnetic flux concentrating block and a second magnetic flux concentrating block wherein the first magnetic flux concentrating block is disposed within the internal bore at the first axial end of the magnetically permeable core of each magnetic field sensor, and the second magnetic flux concentrating block is disposed within the internal bore at the second axial end of the magnetically permeable core of each magnetic field sensor; and an electronics unit operatively and communicatively connected to each magnetic field sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A downhole magnetic field sensing tool comprising:
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a cylindrical tubular member having an internal bore formed therethrough; at least one flux gate magnetic field sensor employing a magnetically permeable core, the magnetically permeable core having a first axial end and a second axial end, the sensor disposed within the internal bore of the cylindrical tubular member; a first magnetic flux concentrating block and a second magnetic flux concentrating block, the first magnetic flux concentrating block disposed within the internal bore proximate to the first axial end, the second magnetic flux concentrating block disposed within the internal bore proximate to the second axial end of the magnetically permeable core, wherein the first magnetic flux concentrating block is configured to create a magnetic flux concentrating region and the second magnetic flux concentrating block is configured to create a corresponding magnetic field concentrating region; an electronics unit, operatively and communicatively connected to the at least one magnetic field sensor, wherein the electronics unit is configured to receive a signal from the at least one magnetic field sensor wherein the magnetic flux concentrating block comprises; a magnetic flux concentrating plug; a magnetic flux concentrating wedge shaped block; and an activation system, which, when activated, translates a position of the magnetic flux concentrating wedge shaped block relative to the magnetic flux concentrating plug in order to change radial contact force against the inner surface of the cylindrical tubular member. - View Dependent Claims (9)
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10. A magnetometer comprising:
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a rotatable cylindrical tubular member having an internal bore formed therethrough, the tubular member being fabricated from a magnetic material; a first magnetic field sensor having a first measurement axis; a second magnetic field sensor having a second measurement axis; and a third magnetic field sensor having a third measurement axis, wherein the first measurement axis is arranged at a non-zero angle relative to the second measurement axis, each magnetic field sensor fixedly mounted within the internal bore of the rotatable cylindrical tubular member, each magnetic field sensor comprising a sensor core having an upper end and a lower end; a first magnetic flux concentrating block disposed proximate to the upper end of each sensor core; a second magnetic flux concentrating block disposed proximate to the lower end of each sensor core; and an electronics unit disposed within the internal bore of the sensor housing and communicatively connected to each magnetic field sensor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification