Data Transmission Apparatus Comprising a Helically Wound Conductor
In one aspect of the present invention, an inductive coupling comprises an inner and outer casing. The inner casing comprises an inner trough formed into an exterior surface with an inner electrical conductor disposed within the inner trough. The outer casing comprises an outer trough formed into the interior surface with an outer electrical conductor disposed within the outer trough. The outer casing is configured to encircle the inner casing such that the inner electrical conductor is in magnetic communication with the outer electrical conductor. A helical geometry is formed in at least one of the inner or outer troughs. The inner and outer casings are configured to move relative to each other.
1 . An inductive coupling, comprising;
an inner casing comprising an inner trough formed into an exterior surface;
an inner electrical conductor disposed within the inner trough;
an outer casing comprising an outer trough formed into an interior surface;
an outer electrical conductor disposed within the outer trough;
the outer casing configured to encircle the inner casing such that the inner electrical conductor is in magnetic communication with the outer electrical conductor;
at least one of the inner or outer troughs comprise a helical geometry; and
the inner and outer casings are configured to move relative to each other.
2 . The coupling of claim 1 , wherein either the inner or outer trough form a toroidal geometry.
3 . The coupling of claim 2 , wherein the toroidal geometry comprises a plurality of electrically independent axially spaced toroidal segments.
4 . The coupling of claim 3 , wherein each electrically independent toroidal segment is in independent electrical communication with distinguishable electrical output readers.
5 . The coupling of claim 2 , wherein the toroidal geometry comprises a plurality of axially spaced toroidal segments in electrically communication with each other.
6 . The coupling of claim 1 , wherein the inner and outer casing are configured to translate axially with respect to each other.
7 . The coupling of claim 1 , wherein when the inner and outer casing axially translated or rotated with respect to each other, a surface overlap between the inner and outer conductor remains constant.
8 . The coupling of claim 1 , wherein the inner and outer casing are configured to rotate with respect to each other.
9 . The coupling of claim 1 , wherein the inner and outer troughs comprise an electrically insulating, magnetically conducting material configured to direct a magnetic field formed from the inner and/or outer electrical conductor toward the adjacent conductor.
10 . The coupling of claim 9 , wherein the electrically insulating, magnetically conducting material is generally U-shaped.
11 . The coupling of claim 1 , wherein expanding and/or contracting a reamer translates a mechanical member within a tool string, wherein the mechanical member is in mechanical communication with the inner or outer casing.
12 . The coupling of claim 11 , wherein the outer casing is firmly affixed to an inner circumference of the mechanical member and configured to translate along an axis of a tool string component.
13 . The coupling of claim 11 , wherein an attachment end of the inner casing is rigidly attached to a fixed member, wherein the inner casing is in communication with the outer casing.
14 . The coupling of claim 11 , wherein the outer casing is in electrical communication with surface equipment.
15 . The coupling of claim 1 , wherein the electrical conductors are configured to transfer power.
16 . The coupling of claim 1 , wherein a plurality of sensors in electrical communication with inner conductor is configured to receive power from a power source in electrical communication with the outer conductor.
17 . The coupling of claim 1 , wherein a plurality of sensors in electrical communication with outer conductor is configured to receive power from a power source in electrical communication with the inner conductor.
18 . The coupling of claim 1 , wherein the inner electrical conductor enters the inner trough from a proximal end, follows a length of the inner trough, enters a port at a distal end leading toward inside the inner casing, travels within the inner casing, and reenters at the proximal end of the inner trough.
19 . The coupling of claim 1 , wherein the inner and outer trough are electrically insulating.
20 . The coupling of claim 1 , wherein the inner and outer troughs are spring loaded to contact one another.