(19)

(11)

EP 2 370 661 A1

(12)

(43) Date of publication: 05.10.2011 Bulletin 2011/40 (21) Application number: 09837002.6 (22) Date of filing: 22.12.2009

(51) International Patent Classification (IPC):  E21B 10/46(2006.01) E21B 10/52(2006.01) E21B 10/62(2006.01) E21B 10/56(2006.01) (86) International application number: PCT/US2009/069093 (87) International publication number: WO 2010/078130 (08.07.2010 Gazette 2010/27)

(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: 31.12.2008 US 347736 (71) Applicant: Baker Hughes Incorporated Houston, TX 77210 (US)	(72) Inventors: VEMPATI, Chaitanya, K. The Woodlands TX 77380 (US) PATEL, Suresh, G. The Woodlands TX 77380 (US) LEDGERWOOD, Leroy, W. The Woodlands TX 77380 (US) MARVEL, Timothy, King The Woodlands TX 77380 (US) WELLS, Michael, R. The Woodlands TX 77380-3615 (US) (74) Representative: Hano, Christian  v. Füner Ebbinghaus Finck Hano Patentanwälte Mariahilfplatz 3 81541 München 81541 München (DE)