(19)

(11)

EP 2 486 216 A2

(12)

(88) Date of publication A3: 21.07.2011 (43) Date of publication: 15.08.2012 Bulletin 2012/33 (21) Application number: 10765889.0 (22) Date of filing: 30.09.2010

(51) International Patent Classification (IPC):  E21B 10/14(2006.01) (86) International application number: PCT/US2010/051019 (87) International publication number: WO 2011/043987 (14.04.2011 Gazette 2011/15)

(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 SE SI SK SM TR (30) Priority: 06.10.2009 US 574549 (71) Applicant: Baker Hughes Incorporated Houston, Texas 77073 (US)	(72) Inventors: BUSKE, Robert J. Houston, Texas 77073 (US) PESSIER, Rudolf C. Houston, Texas 77073 (US) (74) Representative: Mabey, Katherine Frances  Dehns St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)