(19)

(11)

EP 2 356 306 A1

(12)

(43) Date of publication: 17.08.2011 Bulletin 2011/33 (21) Application number: 09832516.0 (22) Date of filing: 10.12.2009

(51) International Patent Classification (IPC):  E21B 10/46(2006.01) E21B 12/02(2006.01) (86) International application number: PCT/US2009/067450 (87) International publication number: WO 2010/068727 (17.06.2010 Gazette 2010/24)

(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: 10.12.2008 US 332107 (71) Applicant: Baker Hughes Incorporated Houston, TX 77210 (US)	(72) Inventors: HUNT, Terry The Woodlands TX 77380 (US) TEODORESCU, Sorin, G. The Woodlands TX 77380 (US) (74) Representative: Hano, Christian  v. Füner Ebbinghaus Finck Hano Patentanwälte Mariahilfplatz 3 81541 München 81541 München (DE)