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(11)

EP 1 165 723 A1

(12)

(43) Date of publication: 02.01.2002 Bulletin 2002/01 (21) Application number: 00913766.2 (22) Date of filing: 03.03.2000

(51) International Patent Classification (IPC)7: C10G 17/00, C10G 17/02, C10G 17/04, C10G 27/00, C10G 33/00, C10G 33/04, B01D 17/05, C09K 3/00 (86) International application number: PCT/US0005/845 (87) International publication number: WO 0052/114 (08.09.2000 Gazette 2000/36)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 05.03.1999 US 123057 P 18.02.2000 US 507389 (71) Applicant: BAKER HUGHES INCORPORATED Houston Texas 77027 (US)	(72) Inventors: NGUYEN, Tran, Minh Houston, TX 77084 (US) KREMER, Lawrence, N. The Woodlands, TX 77381 (US) (74) Representative: Atkinson, Peter Birch et al MARKS & CLERK, Sussex House, 83-85 Mosley Street Manchester M2 3LG Manchester M2 3LG (GB)