Downhole electrical connection
View Patent ↗In one aspect of the invention, a downhole power generation assembly has a downhole tool string component comprising a bore. A collar is rotatably supported within the bore and has a centralized fluid passageway and a plurality of turbine blades. The collar is connected to a power generation element such that rotation of the collar moves the power generation element and induces an electrical current.
1. A double shoulder downhole tool connection, comprising:
box and pin ends having mating threads intermediate mating primary and secondary shoulders;
the secondary shoulder of the box end being in an insert retained in the box end and being intermediate a floating component and the secondary shoulder of the pin end; and
an electrical transmission cable passing through the inserted secondary shoulder of the box end;
wherein the cable comprises a bend at an interface between the inserted secondary shoulder and the floating element.
2. The connection of claim 1 , wherein the electrical transmission cable is a coaxial cable, a triaxle cable, a pair of twisted wires, or a combination thereof.
3. The connection of claim 1 , wherein the cable comprises a plurality of bends at the interface.
4. The connection of claim 1 , wherein the bend is between 50 and 93 degrees.
5. The connection of claim 1 , wherein the bend is an S-shaped bend.
6. The connection of claim 1 , wherein the bend is adapted to accommodate rotation with respect to the floating element and the inserted secondary shoulder.
7. The connection of claim 1 , wherein the cable is disposed in a notch formed in the floating element or the inserted secondary shoulder proximate the bend.
8. The connection of claim 7 , wherein the notch is U-shaped or V-shaped.
9. The connection of claim 1 , wherein the floating element comprises at least one electrical device.
10. The connection of claim 1 , wherein the floating element comprises a portion of a downhole generator.
11. The connection of claim 1 , wherein the downhole generator is connected to fluid driven turbine disposed within a bore of a downhole component which comprises the tool connection.
12. The connection of claim 11 , wherein the downhole generator comprises a collar with a centralized fluid passageway.
13. The connection of claim 12 , wherein the collar comprises fluid engaging blades on its outer diameter.
14. The connection of claim 12 , wherein the collar comprises fluid engaging blades within the centralized fluid passageway.
15. The connection of claim 1 , wherein the cable is part of a transmission system adapted to transmit a signal from a first end of the downhole tool to the other end.
16. The connection of claim 1 , wherein the secondary shoulders each comprises a signal coupler disposed within the groove such that when the threads are fully mated the signal couplers are brought into at least proximity of each other such that a signal couplers are in magnetic communication with each other.
17. The connection of claim 1 , wherein the signal couplers comprises a coil disposed within a magnetically conducting groove.