(19)

(11)

EP 1 856 412 A2

(12)

(88) Date of publication A3: 26.07.2007 (43) Date of publication: 21.11.2007 Bulletin 2007/47 (21) Application number: 06736700.3 (22) Date of filing: 02.03.2006

(51) International Patent Classification (IPC):  F04B 17/03(2006.01) E21B 49/08(2006.01) F04B 49/06(2006.01) (86) International application number: PCT/US2006/007425 (87) International publication number: WO 2006/096452 (14.09.2006 Gazette 2006/37)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK YU (30) Priority: 07.03.2005 US 74124 (71) Applicant: Baker Hughes Incorporated Houston, TX 77019-2118 (US)	(72) Inventors: DIFOGGIO, Rocco Houston, Texas 77099 (US) LEE, Jaedong Houston, Texas 77094 (US) THURAIRAJASINGAM, Rajasingam Kilcurry, Dundalk,Co Louth, 9999 (IE) (74) Representative: Vigars, Christopher Ian  HASELTINE LAKE, Redcliff Quay, 120 Redcliff Street Bristol BS1 6HU Bristol BS1 6HU (GB)