(19)

(11)

EP 1 032 748 A1

(12)

(43) Date of publication: 06.09.2000 Bulletin 2000/36 (21) Application number: 98955012.4 (22) Date of filing: 21.10.1998

(51) International Patent Classification (IPC)7: E21B 31/00 (86) International application number: PCT/US9822/170 (87) International publication number: WO 9920/871 (29.04.1999 Gazette 1999/17)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 21.10.1997 US 63197 07.04.1998 US 80893 (71) Applicant: Cooper, Larry V. Lake Charles, LA 70616 (US)	(72) Inventor: Cooper, Larry V. Lake Charles, LA 70616 (US) (74) Representative: Goddard, David John et al Harrison Goddard Foote,1 Stockport Road,Marple Stockport SK6 6BD Stockport SK6 6BD (GB)