(19)

(11)

EP 2 859 172 A1

(12)

(43) Date of publication: 15.04.2015 Bulletin 2015/16 (21) Application number: 13804590.1 (22) Date of filing: 06.06.2013

(51) International Patent Classification (IPC):  E21B 10/26(2006.01) E21B 4/02(2006.01) E21B 10/38(2006.01) (86) International application number: PCT/US2013/044487 (87) International publication number: WO 2013/188206 (19.12.2013 Gazette 2013/51)

(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: 06.06.2012 US 201213489563 (71) Applicant: Baker Hughes Incorporated Houston, TX 77210-4740 (US)	(72) Inventors: SCHWEFE, Thorsten Virginia Water GU25 4PT (GB) BEUERHAUSEN, Chad, J. Magnolia, TX 77354 (US) (74) Representative: Mabey, Katherine Frances  Dehns St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)