(19)

(11)

EP 1 642 000 A2

(12)

(88) Date of publication A3: 03.02.2005 (43) Date of publication: 05.04.2006 Bulletin 2006/14 (21) Application number: 04748739.2 (22) Date of filing: 14.05.2004

(51) International Patent Classification (IPC):  E21B 19/06(1968.09) (86) International application number: PCT/NO2004/000146 (87) International publication number: WO 2004/101417 (25.11.2004 Gazette 2004/48)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR Designated Extension States: HR LT LV (30) Priority: 15.05.2003 NO 20032220 (71) Applicant: Christensen, Matheus 4640 Soegne (NO)	(72) Inventor: CHRISTENSEN, Matheus N-4640 S gne (NO) (74) Representative: Olsen, Peter Vestergaard et al Patrade A/S Fredens Torv 3A DK-8000 Aarhus C DK-8000 Aarhus C (DK)