(19)

(11)

EP 1 360 391 A1

(12)

(43) Date of publication: 12.11.2003 Bulletin 2003/46 (21) Application number: 02711096.4 (22) Date of filing: 15.02.2002

(51) International Patent Classification (IPC)7: E21B 7/06 (86) International application number: PCT/GB0200/666 (87) International publication number: WO 0206/6779 (29.08.2002 Gazette 2002/35)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 16.02.2001 GB 0103803 (71) Applicant: WEATHERFORD/LAMB, INC. HoustonTexas 77027 (US)	(72) Inventor: MOYES, Peter, B. Dunecht,Aberdeenshire AB32 7AX (GB) (74) Representative: Asquith, Julian Peter  Marks & Clerk,4220 Nash Court,Oxford Business Park South Oxford OX4 2RU Oxford OX4 2RU (GB)