(19)

(11)

EP 2 185 790 A2

(12)

(88) Date of publication A3: 16.04.2009 (43) Date of publication: 19.05.2010 Bulletin 2010/20 (21) Application number: 08797572.8 (22) Date of filing: 10.08.2008

(51) International Patent Classification (IPC):  E21B 43/00(2006.01) E21B 34/06(2006.01) E21B 33/13(2006.01) (86) International application number: PCT/US2008/072733 (87) International publication number: WO 2009/023611 (19.02.2009 Gazette 2009/08)

(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: 13.08.2007 US 891706 (71) Applicant: Baker Hughes Incorporated Houston, TX 77210-4740 (US)	(72) Inventors: GAUDETTE, Sean, L. Katy, TX 77494 (US) MURRAY, Douglas, J. Magnolia, TX 77355 (US) FAY, Peter J. Houston, TX 77040 (US) O'BRIEN, Robert Katy. TX 77494 (US) (74) Representative: Hano, Christian et al v. Füner Ebbinghaus Finck Hano Mariahilfplatz 2 & 3 81541 München 81541 München (DE)