(19)
(11) EP 1 484 471 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.12.2004 Bulletin 2004/51

(43) Date of publication A2:
08.12.2004 Bulletin 2004/50

(21) Application number: 04253273.9

(22) Date of filing: 02.06.2004
(51) International Patent Classification (IPC)7: E21B 17/02
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK

(30) Priority: 03.06.2003 US 453076
02.07.2003 US 612255

(71) Applicant: INTELLISERV INC
Provo, UT 84606 (US)

(72) Inventors:
  • Hall, David R.
    PROVO, uTAH 84604 (US)
  • Fox, Joe
    Spanish Fork, Utah 84660 (US)

(74) Representative: Bucks, Teresa Anne et al
BOULT WADE TENNANT, Verulam Gardens 70 Gray's Inn Road
London WC1X 8BT
London WC1X 8BT (GB)

   


(54) Improved transmission element for downhole drilling components


(57) An apparatus for transmitting data between downhole tools is disclosed in one embodiment of the present invention as including an annular core (70) constructed of a magnetically-conductive material. At least one conductor (72), electrically isolated from the annular core, is coiled around the annular core. An annular housing (28) constructed of an electrically conductive material is used to partially enclose the annular core and the conductive coil. The annular housing is shaped to reside within an annular recess (76) formed into a surface of a downhole tool, and is electrically insulated from the surface. A biasing member (96) is used to effect a bias between the annular housing and the annular recess, urging the annular housing in a direction substantially perpendicular to the surface.






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