(19)

(11)

EP 2 668 368 A2

(12)

(88) Date of publication A3: 11.10.2012 (43) Date of publication: 04.12.2013 Bulletin 2013/49 (21) Application number: 12739296.7 (22) Date of filing: 24.01.2012

(51) International Patent Classification (IPC):  E21B 43/12(2006.01) E21B 43/00(2006.01) (86) International application number: PCT/US2012/022300 (87) International publication number: WO 2012/103052 (02.08.2012 Gazette 2012/31)

(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: 25.01.2011 US 201113013330 (71) Applicant: Baker Hughes Incorporated Houston, TX 77210-4740 (US)	(72) Inventors: SNYDER, Kristopher C. Broken Arrow OK 74012 (US) TINGLER, Kevin Scott Bartlesville OK 74003 (US) (74) Representative: Jeffrey, Philip Michael  Dehns St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)