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Downhole transmission system comprising a coaxial capacitor

a transmission system and capacitor technology, applied in the direction of borehole/well accessories, coupling device connections, survey, etc., can solve the problems of signal loss and attenuation

Inactive Publication Date: 2005-12-29
INTELLISERV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020] It is believed that downhole components of different lengths may produce different impedances, which result in impedance reflections during signal transmission. It is believed that the reflections result in signal loss and attenuation. It is believed that the advantage of a coaxial capacitor in the transmission system may help match impedances of downhole components of different lengths.

Problems solved by technology

Impedance reflections may create noise between two conductors of different impedances, which result in signal loss and attenuation.

Method used

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  • Downhole transmission system comprising a coaxial capacitor
  • Downhole transmission system comprising a coaxial capacitor
  • Downhole transmission system comprising a coaxial capacitor

Examples

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Embodiment Construction

[0043] The disclosed description is meant to illustrate the present invention and not limit its scope. Other embodiments of the present invention are possible within scope and spirit of the claims.

[0044]FIG. 1 shows an embodiment of a downhole tool string 31 suspended in a well bore by a derrick 32. Surface equipment 33, such as a computer, connects to a data swivel 34. The data swivel 34 is adapted to transmit data to and from an integrated transmission network while the downhole tool string 31 is rotating. The integrated transmission network comprises the transmission systems of the individual components 35, 36, 57 of the downhole tool string 31. Preferably the downhole component is a drill pipe 57 or a tool 35. Tools 35 may be located in the bottom hole assembly 37 or along the length of the downhole tool string 31. Examples of tools 35 on a bottom hole assembly 37 comprise sensors, drill bits, motors, hammers, and steering elements. Examples of tools 35 located along the downho...

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PUM

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Abstract

A transmission system in a downhole component comprises a plurality of data transmission elements. A coaxial cable having an inner conductor and an outer conductor is disposed within a passage in the downhole component such that at least one capacitor is disposed in the passage and having a first terminal coupled to the inner conductor and a second terminal coupled to the outer conductor. Preferably the transmission element comprises an electrically conducting coil. Preferably, within the passage a connector is adapted to electrically connect the inner conductor of the coaxial cable and the lead wire. The coaxial capacitor may be disposed between and in electrically communication with the connector and the passage. In another embodiment a connector is adapted to electrical connect a first and a second portion of the inner conductor of the coaxial cable and a coaxial capacitor is in electrical communication with the connector and the passage.

Description

FEDERAL SPONSORSHIP [0001] This invention was made with government support under contract number No. DE-FC26-01NT41229 awarded by the Department of Energy. The government has certain rights in this invention.CROSS REFERENCE TO RELATED APPLICATIONS [0002] None BACKGROUND [0003] This invention relates to transmission systems in downhole components, more specifically to transmission systems comprising capacitors. U.S. Pat. No. 6,670,880, which is herein incorporated by reference, discloses a downhole transmission system through a string of downhole components. A first transmission element is located in one end of each downhole component, which includes a first magnetically-conductive, electrically-insulating trough, and a first electrically conductive coil lying therein. A second data transmission element is located in the other end, with a similar arrangement comprising a second magnetically-conductive, electrically-insulating trough and a second electrically conductive coil. The tran...

Claims

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Application Information

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IPC IPC(8): E21B17/02E21B47/12F16L25/01H01F21/06H01R13/00H01R13/533H01R24/02H04B5/00
CPCE21B17/028E21B47/122F16L25/01H01R13/005H04B5/0018H01R24/40H01R2103/00H04B5/0012H01R13/533E21B47/13E21B17/0283H04B5/28H04B5/22
Inventor HALLPIXTON, DAVID S.JOHNSON, MONTE L.BARTHOLOMEW, DAVID B.HALL, H. TRACY JR.RAWLE, MICHAEL
Owner INTELLISERV
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