Modifying magnetic tilt angle using a magnetically anisotropic material
AssigneeHalliburton Energy Services, Inc.
InventorsLi PAN, Chao-Fu WANG, Wei Hsuan HUANG, Rencheng SONG
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Abstract
Methods and tools for modifying magnetic tilt angle using a magnetically anisotropic material are disclosed. An electromagnetic logging tool includes an antenna coil oriented at a physical tilt angle relative to a longitudinal axis of the tool and a magnetically anisotropic material that modifies a magnetic tilt angle of the coil relative to the physical tilt angle a coil tilted at a physical tilt angle relative to an axis of the tool.
Claims20
An electromagnetic logging tool for acquiring electrical property measurements of a formation penetrated by a borehole, the tool comprising:
- an antenna coil oriented at a physical tilt angle relative to a longitudinal axis of the tool;
- and
- a magnetically anisotropic material that modifies a magnetic tilt angle of the coil relative to the physical tilt angle.
An apparatus, comprising a magnetically anisotropic material having the shape of a tilted collar to modify a magnetic tilt angle of a coil, tilted at a physical tilt angle, to be approximately equal to the physical tilt angle.
An electromagnetic logging method, comprising:
- conveying an electromagnetic logging tool along a borehole that penetrates a formation, the tool having:
- at least one transmit antenna and at least one receive antenna with at least one of said antennas being a tilted antenna oriented at a physical tilt angle relative to a longitudinal axis of the tool;
- and
- a magnetically anisotropic material that modifies a magnetic tilt of the tilted antenna relative to the physical tilt angle;
- driving the at least one transmit antenna to create an electromagnetic field that is affected by the formation;
- obtaining a measurement of the electromagnetic field with the at least one receive antenna;
- and
- deriving an electrical property of the formation based at least in part on said measurement.
Dependencies are inferred from the claim text.