(19)

(11)

EP 2 807 333 A2

(12)

(88) Date of publication A3: 03.04.2014 (43) Date of publication: 03.12.2014 Bulletin 2014/49 (21) Application number: 13734149.1 (22) Date of filing: 17.01.2013

(51) International Patent Classification (IPC):  E21B 45/00(2006.01) E21B 47/12(2012.01) E21B 7/12(2006.01) E21B 47/04(2012.01) E21B 47/00(2012.01) (86) International application number: PCT/IB2013/000763 (87) International publication number: WO 2013/121299 (22.08.2013 Gazette 2013/34)

(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: 23.01.2012 US 201261589445 P 15.01.2013 US 201313741990 (71) Applicant: Transocean Sedco Forex Ventures Limited Grand Cayman 1-1003 (KY)	(72) Inventor: MARTIN, Trenton Kingwood, TX 77339 (US) (74) Representative: Hoffmann Eitle  Patent- und Rechtsanwälte PartmbB Arabellastraße 30 81925 München 81925 München (DE)