(19)

(11)

EP 2 408 993 A2

(12)

(88) Date of publication A3: 13.01.2011 (43) Date of publication: 25.01.2012 Bulletin 2012/04 (21) Application number: 10749179.7 (22) Date of filing: 02.03.2010

(51) International Patent Classification (IPC):  E21B 10/32(2006.01) (86) International application number: PCT/US2010/025867 (87) International publication number: WO 2010/101881 (10.09.2010 Gazette 2010/36)

(84) Designated Contracting States: 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: 03.03.2009 US 156936 P (71) Applicant: Baker Hughes Incorporated Houston, TX 77210 (US)	(72) Inventors: RADFORD, Steven The Woodlands TX 77380 (US) KIDDER, Kevin, G. The Woodlands TX 77380 (US) (74) Representative: Hano, Christian et al v. Füner Ebbinghaus Finck Hano Mariahilfplatz 2 & 3 81541 München 81541 München (DE)