(19)

(11)

EP 2 721 251 A2

(12)

(88) Date of publication A3: 16.05.2013 (43) Date of publication: 23.04.2014 Bulletin 2014/17 (21) Application number: 12801256.4 (22) Date of filing: 07.06.2012

(51) International Patent Classification (IPC):  E21B 43/22(2006.01) E21B 37/00(2006.01) (86) International application number: PCT/US2012/041303 (87) International publication number: WO 2012/173860 (20.12.2012 Gazette 2012/51)

(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 (30) Priority: 17.06.2011 US 201161498249 P 25.05.2012 US 201213481453 (71) Applicant: Baker Hughes Incorporated Houston, TX 77210 (US)	(72) Inventor: QUINTERO, Lirio Houston, TX 77024 (US) (74) Representative: Hoffmann, Benjamin  Dehns St. Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)