(19)

(11)

EP 2 113 016 A1

(12)

(43) Date of publication: 04.11.2009 Bulletin 2009/45 (21) Application number: 08709475.1 (22) Date of filing: 20.02.2008

(51) International Patent Classification (IPC):  C09K 8/08(2006.01) C09K 8/72(2006.01) C09K 8/528(2006.01) (86) International application number: PCT/GB2008/000591 (87) International publication number: WO 2008/102138 (28.08.2008 Gazette 2008/35)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR (30) Priority: 22.02.2007 US 709551 22.02.2007 US 709552 (71) Applicant: Halliburton Energy Services, Inc. Duncan, OK 73533 (US)	(72) Inventor: WELTON, Thomas, D. Duncan, OK 73533 (US) (74) Representative: Curtis, Philip Anthony  A.A. Thornton & Co. 235 High Holborn London WC1V 7LE London WC1V 7LE (GB)