Caliper Tool and Sensor for Use in High Pressure Environments
AssigneeHalliburton Energy Services, Inc.
InventorsEdward Harrigan, Michael Simmons, Laurence T. Wisniewski, Abbas Arian, Gary Lee Fickert
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Abstract
A caliper tool for measuring a shape of a wellbore may include a sensor assembly and a movable measurement component including a hub and a measurement arm extending from the hub, and a magnetically-permeable target coupled to the hub and configured to rotate with the hub upon movement of the measurement arm. A sensor assembly includes primary coil and one or more secondary coils spaced apart from the primary coil, wherein output signals from the secondary coils facilitates measurement of the shape of the wellbore.
Claims20
A caliper tool for measuring a shape of a wellbore, comprising:
- a tool housing defining a tool cavity;
- a movable measurement component comprising:
- a hub rotatably coupled to the tool housing at a pivot axis;
- and
- an upper measurement arm extending from the hub;
- a magnetically-permeable target, coupled to the hub, configured to rotate with the hub upon movement of the upper measurement arm;
- and
- a sensor assembly disposed within the tool cavity, the sensor assembly comprising:
- a primary coil inductively coupled to the target and providing a primary output signal based on a rotational position of the target relative to the tool housing;
- and
- a secondary coil angularly spaced apart from the primary coil relative to the hub about the pivot axis, wherein the secondary coil is inductively coupled to the target and providing a secondary output signal based on the rotational position of the target relative to the tool housing, the primary and secondary output signals facilitating measurement of a shape of the wellbore.
A sensor, comprising:
- a sensor body comprising a non-magnetic material;
- a primary coil disposed within the sensor body, the primary coil configured to provide a primary output signal;
- a secondary coil disposed within the sensor body and adjacent to the primary coil, the secondary coil configured to provide a secondary output signal;
- a magnetically-permeable primary extension at least partially disposed within the sensor body and extending through the primary coil, wherein a proximal end of the primary extension is disposed proximally to an interface end of the sensor body;
- and
- a magnetically-permeable secondary extension at least partially disposed within the sensor body and extending through the secondary coil, wherein a proximal end of the secondary extension is disposed proximally to the interface end of the sensor body.
A method to manufacture a sensor comprising:
- arranging a primary coil adjacent to a secondary coil;
- disposing a magnetically-permeable primary extension through the primary coil;
- disposing a magnetically-permeable secondary extension through the secondary coil;
- introducing a non-magnetic material around the primary coil, the secondary coil, and at least a portion of the primary extension and the secondary extension to form a sensor body;
- and
- annealing the primary extension and the secondary extension within the non-magnetic material.
Dependencies are inferred from the claim text.