Electromagnetic tool using slotted point dipole antennas
AssigneeBench Tree Group, LLC
InventorJian-Qun Wu
Life of this patent
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Abstract
Slotted dipole antennas for use in an antenna system on a drill collar segment is presented. Dipoles may be placed in slots on the drill collar segment. A dipole consists of a ferrite rod with electric wires placed above and below the ferrite rod. Wires may be connected such that wire current forms a loop around the ferrite rod. When a group of slots are used for an antenna, wire holes are constructed between slots. Effectively a single wire may be used to go above all ferrite rods in the group and then turn to go below all the ferrite rods. Two wire segments are in a wire hole connecting two adjacent slots. Currents in the two segments are the same in magnitudes and flow in opposite directions. There is no net current in wires in a wire hole.
Claims20
A method of making an electromagnetic wave propagation tool, the method comprising:
- threading a bottom portion of an antenna wire through a plurality of wire holes positioned beneath an outer surface of a drill collar segment and through a plurality of slots positioned in the outer surface of the drill collar segment, the plurality of wire holes connecting the plurality of slots with each other;
- placing a ferrite rod in each of the plurality of slots on top of the bottom portion of the antenna wire in the plurality of slots;
- and
- turning the antenna wire and threading a top portion of the antenna wire through the plurality of wire holes and slots and on top of the ferrite rod in each of the plurality of slots such that each of the ferrite rods forms a point-dipole, thereby forming a magnetic dipole antenna.
Dependencies are inferred from the claim text.