Loaded transducer for downhole drilling components

• US 7,002,445 B2
• Filed: 05/04/2005
• Issued: 02/21/2006
• Est. Priority Date: 05/06/2003
• Status: Active Grant

• Current Assignee: IntelliServ, LLC (NOV, Inc.)
• Original Assignee: Intelliserv, Inc. (NOV, Inc.)
• Inventors: Hall, David R., Fox, Joe, Hall, H. Tracy Jr., Pixton, David S., Dahlgren, Scott Steven, Briscoe, Michael A., Sneddon, Cameron
• Primary Examiner(s): Edwards, Jr., Timothy
• Application Number:
  US10/908,249
• Publication Number:
  US 20050236160A1
• Time in Patent Office: 293 Days
• Field of Search: 340/854.3, 439190-194, 336/84.R, 336/84.C, 336/84.M, 336130-135, 166/242.6, 175/57
• US Class Current: 336/132
• CPC Class Codes: E21B 17/028 Electrical or electro-magnetic connections

Abstract

A robust transmission element for transmitting information between downhole tools, such as sections of drill pipe, in the presence of hostile environmental conditions, such as heat, dirt, rocks, mud, fluids, lubricants, and the like. The transmission element maintains reliable connectivity between transmission elements, thereby providing an uninterrupted flow of information between drill string components. A transmission element is mounted within a recess proximate a mating surface of a downhole drilling component, such as a section of drill pipe. To close gaps present between transmission elements, transmission elements may be biased with a “spring force,” urging them closer together.

Claims

1. An apparatus for transmitting data between downhole tools, the apparatus comprising:

an annular housing having an angled surface interacting with a recess in one of the downhole tools and exerting a spring force to load the annular housing;

at least one substantially U-shaped element disposed within the loaded annular housing, wherein the U-shaped element is magnetically conductive and electrically insulating; and

at least one electrical conductor disposed within the at least one U-shaped element.

2. The apparatus of claim 1, wherein the electrical conductor is electrically insulated.

3. The apparatus of claim 1, wherein:

the recess is formed to include a locking shoulder; and

the annular housing is retained by the locking shoulder.

4. The apparatus of claim 1, wherein the recess is formed in a mating surface of the one of the downhole tools, and the annular housing is mountable in the recess.

5. The apparatus of claim 4, wherein the annular housing is mountable at a position selected from the group consisting of flush with the mating surface, below the mating surface, and above the mating surface.

6. The apparatus of claim 4, wherein:

the recess has an annular shape; and

the annular housing is biased with respect to the mating surface due to tension between surfaces of the annular housing and the recess.

7. The apparatus of claim 6, wherein the tension between surfaces of the annular housing and the recess are due to tension along at least one of an outside diameter, an inside diameter, and a combination thereof, of the annular housing and recess.

8. The apparatus of claim 4, further comprising a first communications surface on the annular housing, wherein the annular housing is biased with respect to the mating surface;

a second one of the downhole tools having a second loaded annular housing with a second communications surface configured to substantially communicate with the first communications surface.

9. The apparatus of claim 8, wherein the communications surfaces communicate with each other due to direct electrical contact therebetween.

10. The apparatus of claim 8, wherein the communications surfaces communicate with each other by the transfer of magnetic energy therebetween.

11. The apparatus of claim 8, wherein:

the annular housing is substantially residing in the recess; and

a second mating surface on the second one of the downhole tools is shaped to include a second recess, the second loaded annular housing substantially residing in the second recess.

12. The apparatus of claim 11, wherein the second loaded annular housing is biased with respect to the second mating surface to close gaps present between the first and second communicating surfaces when the respective downhole tools are joined.

13. The apparatus of claim 12, wherein a gap is present between the mating surfaces.

14. The apparatus of claim 12, wherein the mating surfaces are in contact with one another.

15. The apparatus of claim 12, further comprising a second biasing member to effect the bias between the second loaded annular housing and the second mating surface.