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EP 2 342 304 A1

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(43) Date of publication: 13.07.2011 Bulletin 2011/28 (21) Application number: 09737117.3 (22) Date of filing: 09.10.2009

(51) International Patent Classification (IPC):  C09K 8/528(2006.01) E21B 43/04(2006.01) C09K 8/80(2006.01) (86) International application number: PCT/GB2009/002423 (87) International publication number: WO 2010/041032 (15.04.2010 Gazette 2010/15)

(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 MK MT NL NO PL PT RO SE SI SK SM TR Designated Extension States: AL BA RS (30) Priority: 10.10.2008 US 104624 P 06.10.2009 US 574037 10.10.2008 US 104610 P 10.10.2008 US 104620 P 10.10.2008 US 104629 P 06.10.2009 US 573999 06.10.2009 US 574018 06.10.2009 US 574054 (71) Applicant: Halliburton Energy Services, Inc. Duncan, OK 73536 (US)

(72) Inventors: REYES, Enrique Duncan OK 73533 (US) WEAVER, Jimmie, D. Duncan OK 73533 (US) BLAUCH, Matthew, Eric Duncan OK 73533 (US) McMECHAN, David, Eugene Duncan OK 73533 (US) (74) Representative: Cottrill, Emily Elizabeth Helen  A.A. Thornton & Co. Chemical 235 High Holborn London WC1V 7LE London WC1V 7LE (GB)