Methods and apparatus for monitoring components of downhole tools
First Claim
Patent Images
1. A downhole tool comprising:
- a moveable component of the downhole tool;
a stationary component of the downhole tool; and
a sensor element configured to sense position of the moveable component relative to the stationary component.
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Accused Products
Abstract
Disclosed herein is a surface controlled subsurface safety valve (SCSSV) that includes a moveable component of the SCSSV and a stationary component of the SCSSV. A sensor element is also included which is configured to sense position of the moveable component relative to the stationary component. Further disclosed herein is a method for sensing position of an object which includes placing a component comprising magnetostrictive material in a location calculated to be contacted by a separate component and causing a stress on the material with the separate component. The method further includes measuring a change in magnetic permeability of the material.
40 Citations
18 Claims
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1. A downhole tool comprising:
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a moveable component of the downhole tool;
a stationary component of the downhole tool; and
a sensor element configured to sense position of the moveable component relative to the stationary component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for sensing position of an object comprising:
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placing a component comprising magnetostrictive material in a location calculated to be contacted by a separate component;
causing a stress on the material with the separate component; and
measuring a change in magnetic permeability of the material.
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17. A method for sensing position for an object comprising:
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placing a magnetostrictive material in a location, the location including a coil;
applying a current to the coil;
measuring magnetic permeability of the material; and
comparing measured magnetic permeability to known permeability of the magnetostrictive material in an unstressed condition. - View Dependent Claims (18)
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Specification