Hole displacement measuring system and method using a magnetic field
First Claim
1. An apparatus for measuring a radius of a hole, comprising:
- a support member having at least one non-articulated arm, each at least one arm having a first end and a second end, the first end rigidly attached to the support member;
a magnet moveably attached to the support member via the second end of each at least one arm;
a first magnetic sensor fixed to the support member for measuring a magnetic field of the magnet;
a second magnetic sensor fixed to the support member for measuring a magnetic field of the magnet; and
a third magnetic sensor fixed to the support, such that it is substantially unaffected by the magnetic field of the magnet in its direction of sensing, for measuring a magnetic field not produced by the magnet to distinguish the influence on the first or second sensor due solely to the magnetic field of the magnet.
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Accused Products
Abstract
Techniques for measuring a displacement include generating a magnetic field using a magnetic field source; measuring a first magnitude of a component of the magnetic field using a sensor disposed within the magnetic field; displacing the magnetic field source; measuring a second magnitude of the component of the magnetic field using the sensor; determining a distance that the magnetic field source is displaced using the first magnitude and the second magnitude. An apparatus for measuring a radius of a hole includes a support member having at least one arm, each having a first end and a second end, the first end attached to the support member; a magnet moveably attached to the support member via the second end of the each of the at least one arm; and a first magnetic sensor fixed to the support member. An apparatus of the invention may further include a second and third sensors.
39 Citations
20 Claims
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1. An apparatus for measuring a radius of a hole, comprising:
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a support member having at least one non-articulated arm, each at least one arm having a first end and a second end, the first end rigidly attached to the support member;
a magnet moveably attached to the support member via the second end of each at least one arm;
a first magnetic sensor fixed to the support member for measuring a magnetic field of the magnet;
a second magnetic sensor fixed to the support member for measuring a magnetic field of the magnet; and
a third magnetic sensor fixed to the support, such that it is substantially unaffected by the magnetic field of the magnet in its direction of sensing, for measuring a magnetic field not produced by the magnet to distinguish the influence on the first or second sensor due solely to the magnetic field of the magnet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A downhole tool for measuring a radius of a borehole, comprising:
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a housing having an exterior surface and an interior;
at least one non-articulated arm, each of the at least one arm having a first end and a second end, the first end rigidly attached to the exterior surface of the housing;
at least one permanent magnet moveably attached to the exterior surface of the housing and each at least one permanent magnet attached to the second end of each at least one non-articulated arm;
a first magnetic sensor, fixed in the interior of the housing for measuring a magnetic field of the at least one permanent magnet; and
a second magnetic sensor fixed within the housing, such that it is substantially unaffected by the magnetic field of the at least one permanent magnet in its direction or sensing, for measuring a magnetic field not produced by the at least one permanent magnet to distinguish the influence on the first sensor due solely to the magnetic field of the at least one permanent magnet. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for measuring the radius of a subsurface borehole comprising:
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disposing a downhole tool within the borehole;
generating a magnetic field using a magnetic field source mounted on the downhole tool;
measuring a first magnitude of a component of the magnetic field using a first sensor mounted on the downhole tool and disposed within the magnetic field;
displacing the magnetic field source by moving the downhole tool along the borehole;
measuring a second magnitude of the component of the magnetic field using a second sensor mourned on the downhole tool and disposed within the magnetic field;
distinguishing the influence on the first or second sensor, due solely to the magnetic field source from the influence of a magnetic field not produced by said magnetic field source, using a third sensor mounted on the downhole tool; and
determining a distance that the magnetic field source is displaced using the first magnitude and the second magnitude. - View Dependent Claims (20)
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Specification