(19)

(11)

EP 2 140 095 A2

(12)

(88) Date of publication A3: 24.12.2008 (43) Date of publication: 06.01.2010 Bulletin 2010/01 (21) Application number: 08746102.6 (22) Date of filing: 17.04.2008

(51) International Patent Classification (IPC):  E21B 10/25(2006.01) (86) International application number: PCT/US2008/060621 (87) International publication number: WO 2008/131095 (30.10.2008 Gazette 2008/44)

(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 (30) Priority: 17.04.2007 US 912350 P (71) Applicant: Baker Hughes Incorporated Houston, TX 77027 (US)	(72) Inventors: KOLTERMANN, Terry The Woodlands, TX 77381 (US) DICK, Aaron Houston, TX 77008 (US) LIN, Chih, C. Spring, TX 77386 (US) (74) Representative: Hano, Christian et al v. Füner Ebbinghaus Finck Hano Mariahilfplatz 2 & 3 81541 München 81541 München (DE)