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(11)

EP 2 358 969 A1

(12)

(43) Date of publication: 24.08.2011 Bulletin 2011/34 (21) Application number: 09837870.6 (22) Date of filing: 15.12.2009

(51) International Patent Classification (IPC):  E21B 10/14(2006.01) E21B 10/62(2006.01) (86) International application number: PCT/US2009/067969 (87) International publication number: WO 2010/080380 (15.07.2010 Gazette 2010/28)

(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: 19.12.2008 US 139392 P 09.06.2009 US 481410 (71) Applicant: Baker Hughes Incorporated Houston, TX 77210 (US)	(72) Inventors: NGUYEN, Don, Q. The Woodlands TX 77380 (US) ZAHRADNIK, Anton, F. The Woodlands TX 77380 (US) PESSIER, Rudolf, C. The Woodlands TX 77380 (US) (74) Representative: Hano, Christian et al v. Füner Ebbinghaus Finck Hano Mariahilfplatz 2 & 3 81541 München 81541 München (DE)