Logging tool ferrites and methods of manufacture
AssigneeHalliburton Energy Services, Inc.
InventorsMatthew Chase Griffing, Jin Ma, Michael Bittar
Life of this patent
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Abstract
A method of fabricating a ferrite for use in a resistivity logging tool includes providing an uncured ferrite material, and pressing the uncured ferrite material into a channel to form the ferrite. The channel is defined on a surface of a bobbin associated with the resistivity logging tool, and the channel can be arcuate and extend at an angle offset from a central axis of the bobbin. The uncured ferrite material is then cured in place within the channels on the bobbin.
Claims20
A method comprising:
- pressing an uncured ferrite material into a channel defined on an outer surface of a bobbin of a resistivity logging tool, wherein the channel is arcuate and extends at an angle offset from a central axis of the bobbin, and wherein the uncured ferrite material comprises a ferrite powder and a binder;
- and
- curing the uncured ferrite material within the channel thereby producing a cured ferrite material, wherein the cured ferrite material conforms to the channel.
A resistivity logging tool, comprising:
- a tool mandrel;
- a bobbin positioned about the tool mandrel and having a cylindrical body with an inner surface and an outer surface, wherein a plurality of channels are defined on the outer surface and laterally adjacent channels are separated by dividers;
- a coil winding wrapped about the outer surface of the body at an angle offset from a central axis of the body;
- and
- a plurality of ferrites cast and cured within the plurality of channels and interposing the coil winding and the tool mandrel, wherein the dividers prevent physical contact between laterally adjacent ferrites and each ferrite conforms to a geometry of a corresponding one of the plurality of channels.
A method of fabricating a ferrite for use in a resistivity logging tool, comprising:
- providing an uncured ferrite material, wherein the uncured ferrite material comprises a ferrite powder and a binder;
- pressing the uncured ferrite material into a channel defined on an outer surface of a bobbin of the resistivity logging tool;
- and
- curing the uncured ferrite material within the channel thereby forming a cured ferrite material, wherein the cured ferrite material conforms to the channel, and the channel is arcuate and extends at an angle offset from a central axis of the bobbin.
Dependencies are inferred from the claim text.