(19)

(11)

EP 1 336 029 A1

(12)

(43) Date of publication: 20.08.2003 Bulletin 2003/34 (21) Application number: 01980735.3 (22) Date of filing: 07.11.2001

(51) International Patent Classification (IPC)7: E21B 43/08, E03B 3/26, B01D 29/15 (86) International application number: PCT/GB0104/937 (87) International publication number: WO 0204/2604 (30.05.2002 Gazette 2002/22)

(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: 22.11.2000 US 721474 (71) Applicant: Weatherford/Lamb, Inc. HoustonTexas 77027 (US)	(72) Inventors: BUCKNER, A., Wayne DI x (US) PARRIS, Daniel, M. Houston, TX 77068 (US) (74) Representative: Talbot-Ponsonby, Daniel  Marks & Clerk4220 Nash CourtOxford Business Park South Oxford OX4 2RU Oxford OX4 2RU (GB)