(19)

(11)

EP 1 499 698 A2

(12)

(88) Date of publication A3: 04.03.2004 (43) Date of publication: 26.01.2005 Bulletin 2005/04 (21) Application number: 03725337.4 (22) Date of filing: 24.04.2003

(51) International Patent Classification (IPC)7: C10G 25/00, C10G 25/05, G01N 33/22, G01N 21/78 (86) International application number: PCT/GB2003/001752 (87) International publication number: WO 2003/091361 (06.11.2003 Gazette 2003/45)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 26.04.2002 GB 0209624 13.08.2002 GB 0218871 11.03.2003 GB 0305551 (71) Applicant: BP OIL INTERNATIONAL LIMITED London EC2M 7BA (GB)	(72) Inventor: TAYLOR, Spencer, Edwin Camberley,Surrey GU15 1DW (GB) (74) Representative: Perkins, Nicholas David et al BP International LimitedPatents and Agreements Division,Chertsey Road Sunbury-on-Thames,Middlesex TW16 7LN Sunbury-on-Thames,Middlesex TW16 7LN (GB)