Apparatus for interfacing with a transmission path

• US 7,482,945 B2
• Filed: 09/17/2007
• Issued: 01/27/2009
• Est. Priority Date: 02/06/2006
• Status: Expired due to Fees

• Current Assignee: Schlumberger Technology Corporation (SLB)
• Original Assignee: David R. Hall
• Inventors: Hall, David R.
• Primary Examiner(s): WONG, ALBERT KANG
• Application Number:
  US11/856,108
• Publication Number:
  US 20080007424A1
• Time in Patent Office: 498 Days
• Field of Search: 340/854.3, 340/854.8, 367/82, 439/191, 166/385
• US Class Current: 340/854.3
• CPC Class Codes: G01V 11/002 Details, e.g. power supply systems for logging instruments, transmitting or recording data, specially adapted for well logging, also if the prospecting method is irrelevant means for transmitting well survey signals E21B47/12; signal transmission systems in general G08C; transmission in general H04B

Abstract

A downhole communication apparatus has a signal coupler disposed in an end of a downhole tubular component. The signal coupler has a transceiver portion and a conductor portion. A data conductor integrated into the downhole tubular component is operably connected at a junction to the conductor portion of the signal coupler. A peripheral electronic device is in communication with the conductor portion of the signal coupler, either through an electrical coil wrapped around at least part of the conductor portion of the signal coupler or direct electrical contact with the conductor portion of the signal coupler.

Claims

1. A downhole communication apparatus comprising:

a signal coupler proximate an end of a downhole tubular component, the signal coupler comprising a transceiver portion and a conductor portion;

a data conductor integrated into the downhole tubular component and electrically connected at a junction interface to the conductor portion of the signal coupler; and

a peripheral electronic device in communication with the junction interface;

wherein the peripheral electronic device is in communication with the data conductor through the junction interface;

wherein the junction interface is an inductive interface.

2. The apparatus of claim 1 wherein the data conductor is selected from the group consisting of wires, coaxial cables, triaxial cables and combinations thereof.

3. The apparatus of claim 1 wherein the peripheral electronic device comprises at least one device selected from the group consisting of integrated circuits, pressure sensors, temperature sensors, actuators, piezoelectric devices, torque sensors, gyroscopes, inclinometers, accelerometers, chemical sensors, vibration sensors, processing elements and combinations thereof.

4. The apparatus of claim 1 wherein the peripheral electronic device is located in the wall of the downhole component, in the bore of the downhole component, affixed to the outside of the downhole component, or combinations thereof.

5. The apparatus of claim 1 wherein the downhole component is part of a downhole tool string.

6. The apparatus of claim 5, wherein data is transmitted through the downhole tool string by a system of data conductors and signal couplers in the downhole tool string.

7. The apparatus of claim 6 wherein the peripheral electronic device is adapted to transmit information on the downhole tool string.

8. The apparatus of claim 6, wherein the peripheral electronic device transmits data at a carrier frequency distinct from a carrier frequency of separate data transmissions on the tool string.

9. The apparatus of claim 1, wherein the junction interface comprises a direct electrical connection to the data conductor, the peripheral electronic device, and the conductor portion of the signal coupler.

10. The apparatus of claim 1, wherein the inductive interface comprise an electrical coil electrically isolated from the conductor portion of the signal coupler.

11. The apparatus of claim 10, wherein the electrical coil comprises at least one turn of wire around the conductor portion of the signal coupler.

12. The apparatus of claim 10, wherein the electrical coil is disposed in a magnetically conductive material.

13. The apparatus of claim 10, further comprising a dielectric material intermediate the electrical coil and the conductor portion of the signal coupler.

14. The apparatus of claim 1, wherein the junction interface is located on a lead-in of the conductor portion of the signal coupler.

15. The apparatus of claim 1, wherein the junction interface is located on a capacitor of the conductor portion of the signal coupler.