(19)

(11)

EP 1 794 454 A1

(12)

(43) Date of publication: 13.06.2007 Bulletin 2007/24 (21) Application number: 05781685.2 (22) Date of filing: 07.09.2005

(51) International Patent Classification (IPC):  F04B 47/08(2006.01) E21B 43/12(2006.01) F04B 9/10(2006.01) E21B 43/01(2006.01) (86) International application number: PCT/GB2005/003422 (87) International publication number: WO 2006/027562 (16.03.2006 Gazette 2006/11)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 08.09.2004 GB 0419915 (71) Applicant: DES Enhanced Recovery Limited 3 Prospect Place Westhill Aberdeen, AB32 6SY (GB)	(72) Inventors: DONALD, Ian Moneymusk, Aberdeenshire AB51 7TJ (GB) REID, John Invergowrie, Dundee DD2 5LJ (GB) (74) Representative: Brown, Deborah Frances  Murgitroyd & Company Scotland House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)