(19)

(11)

EP 1 817 475 A2

(12)

(88) Date of publication A3: 27.07.2006 (43) Date of publication: 15.08.2007 Bulletin 2007/33 (21) Application number: 05823765.2 (22) Date of filing: 01.12.2005

(51) International Patent Classification (IPC):  E21B 17/01(2006.01) (86) International application number: PCT/IB2005/003638 (87) International publication number: WO 2006/059220 (08.06.2006 Gazette 2006/23)

(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: 01.12.2004 US 632245 P (71) Applicant: Vetco Gray Scandinavia AS 1375 Billingstad (NO)	(72) Inventor: SLAGSVOLD, Lars N-3014 Drammen (NO) (74) Representative: Löfgren, Jonas et al Bjerkéns Patentbyrå KB Box 1274 801 37 Gävle 801 37 Gävle (SE)