Magnetic permeability sensor with permanent magnet for downhole sensing
AssigneeHalliburton Energy Services, Inc.
InventorsGregory Thomas Werkheiser, Michael Linley Fripp, Jinhua Cao
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Abstract
A sensing apparatus in the present disclosure is configured to measure magnetic flux of a magnetic field generated by a magnetic source and flowing through a sample slurry to determine magnetic permeability of the sample slurry. The sensing apparatus comprises a magnetic sensor inside a sensor housing that measures magnetic flux through a sensor housing made of a ferromagnetic material. The magnetic sensor sends measurements of the magnetic flux to a computing device that determines the presence of cementing fluids in the slurry based on the magnetic flux measurements.
Claims20
An apparatus comprising:
- a housing that houses a magnetic field sensor, wherein the housing is adapted to integrate into an oilfield tubular;
- a source of magnetic flux;
- a magnetic sensor housed within the housing and situated to measure magnetic flux generated by the source of magnetic flux;
- and
- a computing device communicatively coupled to the magnetic sensor and programmed to,
- determine whether a magnetic measurement transmitted from the magnetic sensor satisfies at least a first detection criterion;
- and
- indicate presence of a first fluid based on a determination that the magnetic measurement satisfies the first detection criterion which corresponds to a first magnetic permeability associated with the first fluid.
An apparatus comprising:
- an oilfield tubular;
- a housing at least partially integrated into the oilfield tubular;
- a source of magnetic flux;
- a magnetic sensor housed within the housing and situated to measure the magnetic flux generated by the source of magnetic flux;
- and
- a computing device coupled to the magnetic sensor programmed to,
- determine whether a magnetic measurement transmitted from the magnetic sensor satisfies at least a first detection criterion;
- and
- indicate presence of a first fluid based on a determination that the magnetic measurement satisfies the first detection criterion which corresponds to a first magnetic permeability associated with the first fluid.
An apparatus comprising:
- a housing that houses a magnetic sensor and that comprises a plug made of a ferromagnetic material, wherein the housing is adapted to integrate into an oilfield tubular with the plug providing a window into an interior of the oilfield tubular;
- a source of magnetic flux;
- a magnetic sensor housed within the housing and located between the source of magnetic flux and the plug;
- a computing device communicatively coupled to the magnetic sensor and programmed to,
- determine whether a magnetic measurement transmitted from the magnetic sensor satisfies at least a first detection criterion;
- and
- indicate presence of a first fluid based on a determination that the magnetic measurement satisfies the first detection criterion which corresponds to a first magnetic permeability associated with the first fluid;
- and
- a shield to protect the housing, the source of magnetic flux, the magnetic sensor, and the computing device.
Dependencies are inferred from the claim text.