Electrical transmission line diametrical retention mechanism
View Patent ↗The invention is a mechanism for retaining an electrical transmission line. In one embodiment of the invention it is a system for retaining an electrical transmission line within downhole components. The invention allows a transmission line to be attached to the internal diameter of drilling components that have a substantially uniform drilling diameter. In accordance with one aspect of the invention, the system includes a plurality of downhole components, such as sections of pipe in a drill string, drill collars, heavy weight drill pipe, and jars. The system also includes a coaxial cable running between the first and second end of a drill pipe, the coaxial cable having a conductive tube and a conductive core within it. The invention allows the electrical transmission line to withstand the tension and compression of drill pipe during routine drilling cycles.
1. An electrical transmission line retention mechanism in a pipe component having ends, comprising:
a first slot formed in the pipe component intermediate its ends and exposed at an internal diameter of the pipe component;
a second slot, wider than the first slot, formed in the pipe component and aligned with and overlapping the first slot; and
the second slot also exposed at the internal diameter and terminating at one of the ends of the pipe component;
wherein the first and second slots also adapted to affix an electrical transmission line along the internal diameter of the pipe component.
2. A retention mechanism of claim 1 wherein the mechanism comprise more than two slots.
3. The retention mechanism of claim 2 wherein the more than two slots have increasing widths.
4. The retention mechanism of claim 1 wherein an undercut is formed by the first and second slots.
5. The retention mechanism of claim 1 wherein a shoulder is formed by the first and second slots.
6. The retention mechanism of claim 1 wherein the slot overlap is offset.
7. The retention mechanism of claim 1 wherein the end may be selected from the group consisting of a box end and a pin end.
8. The retention mechanism of claim 1 wherein the conductive tube is press-fit into the slots.
9. A system for mechanically retaining an electrical transmission line in a pipe component having ends, comprising:
a coaxial cable, the coaxial cable comprising a conductive tube and a conductive core within it, the conductive tube having a first and a second outer diameter, the second outer diameter being larger than the first outer diameter;
a first slot formed in the pipe component intermediate its ends and exposed at an internal diameter of the pipe component;
a second slot, wider than the first slot, formed in the pipe component and aligned with and overlapping the first slot;
the second slot also exposed at the internal diameter and terminating at one of the ends of the pipe component; and
the conductive tube is disposed within the slits with the first and second slots forming complementary recesses with the first and second diameters of the conductive tube;
wherein the conductive tube is in electrical communication with the internal diameter of the pipe component.
10. The system of claim 9 wherein the conductive tube has an elasticity such that the conductive tube is in tension.
11. The system of claim 9 wherein the slot overlap length is within the elastic deformation range of the conductive tube.
12. The system of claim 9 wherein the system comprises more than two slots.
13. The system of claim 12 wherein the more than two slots have increasing widths.
14. The system of claim 9 wherein the end may be selected from the group consisting of a box end or a pin end.
15. The system in claim 9 wherein the conductive tube is press-fit into the slots.
16. A system for mechanically retaining an electrical transmission line for use in a rotary dull string, the drill string comprising individual drill components, each drill component containing the electrical transmission line, the system comprising;
a drill component with a substantially uniform internal diameter with a pin end and a box end;
a coaxial cable, the coaxial cable comprising a conductive tube and a conductive core within it, the conductive tube having a first and a second outer diameter, the second outer diameter being larger than the first outer diameter;
a first slot formed in the pipe component intermediate its ends and exposed at an internal diameter of the pipe component;
a second slot, wider than the first slot, formed in the pipe component and aligned with and overlapping the first slot;
the second slot also exposed at the internal diameter and terminating at one of the ends of the pipe component;
the first and second slot forming an undercut; and
the conductive tube is disposed within the slots with the first and second slots forming complementary recesses with the first and second diameters of the conductive tube;
wherein the conductive tube is in electrical communication with the internal diameter of the drill component.
17. The system of claim 16 wherein the system comprises more than two slots.
18. The system of claim 16 wherein the more than two slots have increasing widths.
19. The system of claim 18 wherein the conductive tube has an elasticity such that the conductive tube is in tension.
20. The system of claim 16 wherein the slot overlap length is within the elastic deformation range of the conductive tube.
21. The system in claim 16 wherein the tube is tension between 300 and 1200 foot pound-force.
22. The system in claim 16 wherein the conductive tube is press-fit into the slots.