(19)

(11)

EP 1 963 613 A1

(12)

(43) Date of publication: 03.09.2008 Bulletin 2008/36 (21) Application number: 06839280.2 (22) Date of filing: 08.12.2006

(51) International Patent Classification (IPC):  E21B 23/00(2006.01) E21B 33/076(2006.01) E21B 33/068(2006.01) E21B 41/00(2006.01) (86) International application number: PCT/US2006/047115 (87) International publication number: WO 2007/067786 (14.06.2007 Gazette 2007/24)

(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 (30) Priority: 08.12.2005 NO 20055822 (71) Applicant: FMC Technologies, Inc. Houston, TX 77067 (US)	(72) Inventor: LAWSON, John E. Todmorden OL14 TU (GB) (74) Representative: Wright, Robert Gordon McRae  Elkington and Fife LLP, Prospect House, 8 Pembroke Road Sevenoaks, Kent TN13 1XR Sevenoaks, Kent TN13 1XR (GB)