(19)

(11)

EP 1 330 590 A1

(12)

(43) Date of publication: 30.07.2003 Bulletin 2003/31 (21) Application number: 01978643.3 (22) Date of filing: 30.10.2001

(51) International Patent Classification (IPC)7: E21B 19/16, E21B 21/00 (86) International application number: PCT/GB0104/803 (87) International publication number: WO 0203/6928 (10.05.2002 Gazette 2002/19)

(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: 31.10.2000 GB 0026598 (71) Applicant: Coupler Developments Limited Douglas,Isle of Man IM1 1JD (GB)	(72) Inventor: AYLING, Laurence John Camberley,Surrey GU15 1LH (GB) (74) Representative: Lucas, Brian Ronald  Lucas & Co.135 Westhall Road Warlingham,Surrey CR6 9HJ Warlingham,Surrey CR6 9HJ (GB)