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(11)

EP 2 225 440 A1

(12)

(43) Date of publication: 08.09.2010 Bulletin 2010/36 (21) Application number: 08854551.2 (22) Date of filing: 26.11.2008

(51) International Patent Classification (IPC):  E21B 49/00(2006.01) (86) International application number: PCT/US2008/084857 (87) International publication number: WO 2009/070672 (04.06.2009 Gazette 2009/23)

(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 MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 27.11.2007 US 990521 P (71) Applicant: Baker Hughes Incorporated Houston, TX 77210-4740 (US)	(72) Inventors: TCHAKAROV, Borislav, J. Humble TX 77396 (US) HUNZIKER, James, C. New Caney TX 77357 (US) PHAN, Quan, V. Houston TX 77065 (US) AZEEMUDDIN, Mohammed Sugar Land TX 77478 (US) ONG, See, Hong Sugar Land TC 77479 (US) (74) Representative: Hano, Christian  v. Füner Ebbinghaus Finck Hano Patentanwälte Mariahilfplatz 3 81541 München 81541 München (DE)