(19)
(11) EP 2 785 969 A2

(12)

(88) Date of publication A3:
20.03.2014

(43) Date of publication:
08.10.2014 Bulletin 2014/41

(21) Application number: 12809890.2

(22) Date of filing: 30.11.2012
(51) International Patent Classification (IPC): 
E21B 44/00(2006.01)
(86) International application number:
PCT/US2012/067402
(87) International publication number:
WO 2013/082498 (06.06.2013 Gazette 2013/23)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 01.12.2011 US 201161565736 P

(71) Applicant: National Oilwell Varco, L.P.
Houston, Texas 77036 (US)

(72) Inventors:
  • PINK, Tony
    Houston, Texas 77018 (US)
  • REID, David
    Spring, Texas 77379 (US)
  • BRUCE, Andrew
    Houston, Texas 77036 (US)

(74) Representative: Lucas, Brian Ronald 
Lucas & Co. 135 Westhall Road
Warlingham, Surrey CR6 9HJ
Warlingham, Surrey CR6 9HJ (GB)

   


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