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Apparatus for electrical power and/or data transfer between rotating components in a drill string

a technology of rotating components and drill strings, which is applied in the direction of drilling pipes, surveying, borehole/well accessories, etc., can solve the problems of significantly reducing reducing so as to reduce the effective magnetic permeability of the magnetic path and reduce the overall efficiency of coupling

Inactive Publication Date: 2010-09-09
SMITH INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a non-contact electrical coupling device for transmitting power and data between rotating components in downhole tools. The device includes first and second wound toroidal cores that are rotationally fixed to the shaft and housing, respectively. The device utilizes a conductive loop formed by the shaft and housing to transmit electrical signals between the components. The invention offers improved non-contact electrical transmission and high-speed data communication compared to conventional inductive couplings. The device is advantageously unaffected by the size of the gap between the rotating components and can be used in rotary steerable tools.

Problems solved by technology

Those of ordinary skill in the art will appreciate that the presence of the air gap in an inductive coupling reduces the effective magnetic permeability of the magnetic path, which can significantly reduce the overall efficiency of the coupling.

Method used

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  • Apparatus for electrical power and/or data transfer between rotating components in a drill string
  • Apparatus for electrical power and/or data transfer between rotating components in a drill string
  • Apparatus for electrical power and/or data transfer between rotating components in a drill string

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Embodiment Construction

[0026]Referring first to FIGS. 1 through 8, it will be understood that features or aspects of the embodiments illustrated may be shown from various views. Where such features or aspects are common to particular views, they are labeled using the same reference numeral. Thus, a feature or aspect labeled with a particular reference numeral on one view in FIGS. 1 through 8 may be described herein with respect to that reference numeral shown on other views.

[0027]FIG. 1 illustrates a drilling rig 10 suitable for the deployment of exemplary embodiments of the present invention. In the exemplary embodiment shown on FIG. 1, a semisubmersible drilling platform 12 is positioned over an oil or gas formation (not shown) disposed below the sea floor 16. A subsea conduit 18 extends from deck 20 of platform 12 to a wellhead installation 22. The platform may include a derrick 26 and a hoisting apparatus 28 for raising and lowering the drill string 30, which, as shown, extends into borehole 40 and in...

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Abstract

A downhole tool includes a non-contact, electrical coupling device configured to transmit electrical power and / or data between relatively rotating components. In one embodiment, the coupling device includes at least first and second wound toroidal cores deployed about a shaft. At least one of the wound toroidal cores is rotationally fixed to the shaft, while at least one other is rotationally fixed to a housing in which the shaft is deployed. The shaft forms a portion of a conductive loop that extends through the toroids. A non-contact electrical pathway is advantageously provided for high power electrical transmission and / or high speed data transmission across a gap between first and second rotating members of a downhole assembly.

Description

RELATED APPLICATIONS[0001]None.FIELD OF THE INVENTION[0002]The present invention relates generally to downhole tools having rotating components, for example, including directional drilling tools such as a steering tool or a mud motor. More particularly, embodiments of this invention relate to a downhole assembly including a non-contact apparatus for transmitting electrical power and / or data between first and second members of the assembly that are disposed to rotate with respect to one another (such as a shaft rotating in a housing).BACKGROUND OF THE INVENTION[0003]As is well-known in the industry, hydrocarbons are recovered from subterranean reservoirs by drilling a borehole (wellbore) into the reservoir. Such boreholes are commonly drilled using a rotating drill bit attached to the bottom of a drilling assembly (which is commonly referred to in the art as a bottom hole assembly or a BHA). The drilling assembly is commonly connected to the lower end of a drill string including a lo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B43/00E21B41/00E21B7/08E21B47/12
CPCE21B47/122E21B4/02E21B47/13
Inventor MOORE, ROBERT A.
Owner SMITH INT INC
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