(19)

(11)

EP 2 882 924 A1

(12)

(43) Date of publication: 17.06.2015 Bulletin 2015/25 (21) Application number: 13828584.6 (22) Date of filing: 08.08.2013

(51) International Patent Classification (IPC):  E21B 19/16(2006.01) E21B 19/20(2006.01) E21B 17/02(2006.01) (86) International application number: PCT/US2013/054197 (87) International publication number: WO 2014/026038 (13.02.2014 Gazette 2014/07)

(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 Designated Extension States: BA ME (30) Priority: 08.08.2012 US 201261680896 P (71) Applicant: National Oilwell Varco, L.P. Houston, Texas 77036 (US)	(72) Inventor: BELIK, Jaroslav Smithville, Texas 78957 (US) (74) Representative: Beck Greener  Fulwood House 12 Fulwood Place London WC1V 6HR London WC1V 6HR (GB)