(19)
(11) EP 1 809 855 A2

(12)

(88) Date of publication A3:
22.03.2007

(43) Date of publication:
25.07.2007 Bulletin 2007/30

(21) Application number: 05808892.3

(22) Date of filing: 18.10.2005
(51) International Patent Classification (IPC): 
E21B 19/18(2006.01)
(86) International application number:
PCT/US2005/037353
(87) International publication number:
WO 2006/044848 (27.04.2006 Gazette 2006/17)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 19.10.2004 US 620049 P

(71) Applicant: National-Oilwell, L.P.
Houston, TX 77042 (US)

(72) Inventors:
  • FEHRES, Neil, E.
    Sugar Land, TX 77479-6984 (US)
  • YOST, Thomas, A.
    Houston, TX 77070-3204 (US)

(74) Representative: Copsey, Timothy Graham et al
Kilburn & Strode, 20 Red Lion Street
London WC1R 4PJ
London WC1R 4PJ (GB)

   


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