Link module for a downhole drilling network

• US 20050001735A1
• Filed: 07/02/2003
• Published: 01/06/2005
• Est. Priority Date: 07/02/2003
• Status: Active Grant

• Current Assignee: IntelliServ, LLC (NOV, Inc.)
• Original Assignee: Intelliserv International Holding Ltd. (NOV, Inc.)
• Inventors: Hall, David R., Fox, Joe
• Granted Patent: US 7,224,288 B2
• Time in Patent Office: Days
• US Class Current: 340/853.700
• CPC Class Codes: E21B 47/01 Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
• CPC Class Codes: E21B 47/13 by electromagnetic energy, e.g. radio frequency
• 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 repeater is disclosed in one embodiment of the present invention as including a cylindrical housing, characterized by a proximal end and a distal end, and having a substantially cylindrical wall, the cylindrical wall defining a central bore passing therethrough. The cylindrical housing is formed to define at least one recess in the cylindrical wall, into which a repeater is inserted. The cylindrical housing also includes an annular recess formed into at least one of the proximal end and the distal end. An annular transmission element, operably connected to the repeater, is located in the annular recess. In selected embodiments, the annular transmission element inductively converts electrical energy to magnetic energy. In other embodiments, the annular transmission element includes an electrical contact to transmit electrical energy directly to another contact.

Claims

1. A downhole repeater assembly comprising:

a cylindrical housing, characterized by a proximal end and a distal end, having a substantially cylindrical wall, the cylindrical wall defining a central bore passing therethrough;

the cylindrical housing further formed to define at least one recess in the cylindrical wall;

a repeater circuit located within the at least one recess;

the cylindrical housing further comprising an annular recess formed into at least one of the proximal end and the distal end; and

an annular transmission element located in the annular recess, the annular transmission element operably connected to the repeater.

2. The downhole repeater assembly of claim 1, further comprising a first channel, formed within the cylindrical housing, extending from the at least one recess to at least one of the proximal and distal end.

3. The downhole repeater assembly of claim 1, wherein the annular transmission element inductively converts electrical energy to magnetic energy.

4. The downhole repeater assembly of claim 1, wherein the annular transmission element comprises an electrical contact to transmit electrical energy directly to another contact.

5. The downhole repeater assembly of claim 1, further comprising at least one battery located in the at least one recess.

6. The downhole repeater assembly of claim 1, wherein:

the cylindrical housing is inserted into the bore of a host downhole tool; and

the host downhole tool further comprises a pin end and a box end, the pin end having an external threaded portion and the box end having an internal threaded portion.

7. The downhole repeater assembly of claim 6, wherein the box end lacks an integrated secondary shoulder.

8. The downhole repeater assembly of claim 7, further comprising a secondary shoulder insert inserted into the box end, independent from the box end, capable of absorbing stresses normally incident on an integrated secondary shoulder.

9. The downhole repeater assembly of claim 8, wherein stresses normally incident on a secondary shoulder are not imposed on the cylindrical housing.

10. The downhole repeater assembly of claim 8, wherein surface characteristics of the secondary shoulder insert engage corresponding surface characteristics of the inside diameter of the host tool to transfer a load, incident on the secondary shoulder insert, to the host tool.

11. The downhole repeater assembly of claim 1, wherein the repeater circuit further comprises a data acquisition circuit to acquire data from at least one sensor.

12. The downhole repeater assembly of claim 11, wherein the at least one sensor is selected from the group consist of a pressure transducer, an inclinometer, a thermocoupler, an accelerometer, an imaging device, and a seismic device.

13. The downhole repeater assembly of claim 1, wherein the repeater circuit further includes components selected from the group consisting of signal filtering circuitry, signal error checking circuitry, device control circuitry, a modem, a digital signal processor, and a microcontroller.

14. A downhole module comprising:

a cylindrical housing, characterized by a proximal end and a distal end, having a substantially cylindrical wall, the cylindrical wall defining a central bore passing therethrough;

the cylindrical housing further formed to define at least one recess in the cylindrical wall;

a repeater circuit located within the at least one recess; and

a data acquisition circuit located within the at least one recess, connected to the repeater circuit, to acquire data from at least one sensor.

15. The downhole module of claim 14, further comprising an uphole data link extending from the repeater circuit to the proximal end, and a downhole data link extending from the repeater circuit to the distal end.

16. The downhole module of claim 14, wherein the cylindrical housing is characterized by at least one annular recess formed into at least one of the proximal end and the distal end.

17. The downhole module of claim 16, wherein the cylindrical housing further comprises an annular transmission element located in the annular recess.

18. The downhole module of claim 14, further comprising at least one battery located in the at least one recess.

19. The downhole module of claim 14, wherein the at least one sensor is selected from the group consisting of a pressure transducer, an inclinometer, a thermocoupler, an accelerometer, an imaging device, and a seismic device.

20. A downhole repeater assembly comprising:

a cylindrical housing, characterized by a proximal end and a distal end, having a substantially cylindrical wall, the cylindrical wall defining a central bore passing therethrough;

the cylindrical housing having at least one recess formed into the outer rounded surface of the cylindrical wall; and

a signal repeater located within the at least one recess.