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US 2003/0117134 A1Published application
Downhole magnetic-field based feature detector
AssigneeSchlumberger Technology Corporation
InventorJames S. Almaguer
Life of this patent
Estimating the term…
Abstract
An apparatus that is usable with a subterranean well includes a magnetometer and a circuit. The magnetometer indicates a strength of a magnetic field that at least partially extends through a portion of a downhole pipe. The circuit is coupled to the magnetometer to indicate a feature present in the pipe based on the indication from the magnetometer.
Claims54
An apparatus usable with a subterranean well, comprising:
- a magnetometer to indicate a strength of a magnetic field that at least partially extends through a portion of a downhole pipe;
- and
- a circuit coupled to the magnetometer to indicate a feature present in the pipe based on the indication from the magnetometer.
An apparatus usable with a subterranean well, comprising:
- a magnet to establish a flux field near the apparatus, the magnet being formed from a material having magnetic properties similar to SmCo-30 and the flux field at least partially extending through a portion of a downhole pipe;
- and
- a winding to generate a signal produced by a change in a strength of the flux field to indicate detection of a feature of the pipe.
An apparatus usable with a subterranean well, comprising:
- a magnet to establish a flux field that at least partially extends through a portion of a downhole pipe;
- and
- a winding to generate a signal produced by a change in a strength of the flux field to indicate a feature of the pipe , the winding having at least approximately 1000 turns.
An apparatus usable with a subterranean well, comprising:
- a magnet to establish a flux field near the apparatus, flux field at least partially extending through a portion of a downhole pipe;
- and
- a winding to generate a signal produced by a change in a strength of the flux field to indicate a feature of the pipe,
- wherein the apparatus has a longitudinal dimension not exceeding approximately two inches.
1 more element
An apparatus usable with a subterranean well, comprising:
- a magnet to establish a flux field that extends at least partially through a portion of a downhole pipe;
- and
- a winding to generate a signal produced by a change in a strength of the flux field to indicate detection of a feature of the pipe, the winding having at least approximately 40,000 turns.
An apparatus usable in a subterranean well, comprising:
- a first winding to generate a first signal in response to a change in a magnetic field at least partially extending through the first winding and at least partially extending through a portion of a downhole pipe to indicate detection of a feature of the pipe;
- a second winding to generate a second signal in response to a change in the magnetic field to indicate detection of the feature, the magnetic field at least partially extending through the second winding;
- a first interface coupled to the first winding to communicate the first signal to the surface of the well when the apparatus is in a powered mode;
- and
- a second interface coupled to the second winding to communicate the second signal to the surface of the well when the apparatus in an unpowered mode.
2 more elements
A method usable with a subterranean well, comprising:
- sensing a strength of a magnetic field that at least partially extends through a portion of a downhole pipe;
- and
- based on the sensed strength, generating a signal indicative of a feature of the pipe.
A method usable with a subterranean well, comprising:
- using a magnet to establish a flux field that at least partially extends through a portion of a downhole pipe, the magnet being formed from a material having magnetic properties similar to SmCo-30;
- and
- sensing a change in a strength of the flux field to indicate detection of a feature of the pipe.
A method usable with a subterranean well, comprising:
- establishing a magnetic flux field that at least partially extends through a portion of a downhole pipe;
- and
- using a winding to generate a signal produced by a change in a strength of the flux field, the winding having at least approximately 40,000 turns.
A method usable in a subterranean well, comprising:
- providing a first winding to generate a first signal in response to a change in a magnetic field at least partially extending through the first winding and at least partially extending through a portion of a downhole pipe to indicate detection of a feature of the pipe;
- providing a second winding to generate a second signal in response to a change in the magnetic field to indicate detection of the downhole feature, the magnetic field at least partially extending through the second winding;
- using a first interface coupled to the first winding to communicate the first signal to the surface of the well in a powered mode;
- and
- using a second interface coupled to the second winding to communicate the second signal to the surface of the well in an unpowered mode.
2 more elements
A method usable with a subterranean well, comprising:
- sensing a strength of a magnetic field that at least partially extends through a portion of a downhole pipe;
- and
- based on the sensed strength, generating a signal indicative of sudden transverse movement.
A method usable with a subterranean well, comprising:
- using a magnet to establish a flux field that at least partially extends through a portion of a downhole pipe, the magnet being formed from a material having magnetic properties similar to SmCo-30;
- and
- sensing a change in a strength of the flux field to indicate sudden transverse movement.
A method usable with a subterranean well, comprising:
- establishing a magnetic flux field that at least partially extends through a portion of a downhole pipe;
- and
- using a winding to generate a signal produced by a change in a strength of the flux field to indicate sudden transverse movement, the winding having at least approximately 40,000 turns.
A method usable in a subterranean well, comprising:
- providing a first winding to generate a first signal in response to a change in a magnetic field at least partially extending through the first winding and at least partially extending through a portion of a downhole pipe to indicate sudden transverse movement;
- providing a second winding to generate a second signal in response to a change in the magnetic field to indicate detection of the downhole feature, the magnetic field at least partially extending through the second winding;
- using a first interface coupled to the first winding to communicate the first signal to the surface of the well in a powered mode;
- and
- using a second interface coupled to the second winding to communicate the second signal to the surface of the well in an unpowered mode.
2 more elements
Dependencies are inferred from the claim text.