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(11)

EP 2 334 752 A2

(12)

(88) Date of publication A3: 01.07.2010 (43) Date of publication: 22.06.2011 Bulletin 2011/25 (21) Application number: 09736634.8 (22) Date of filing: 09.10.2009

(51) International Patent Classification (IPC):  C09K 8/80(2006.01) E21B 43/04(2006.01) C09K 8/57(2006.01) (86) International application number: PCT/GB2009/002424 (87) International publication number: WO 2010/041033 (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 104620 P 06.10.2009 US 574054 10.10.2008 US 104610 P 10.10.2008 US 104624 P 10.10.2008 US 104629 P 06.10.2009 US 573999 06.10.2009 US 574037 06.10.2009 US 574018 (71) Applicant: Halliburton Energy Services, Inc. Duncan, OK 73536 (US)

(72) Inventors: REYES, Enrique Duncan Oklahoma 73533 (US) WEAVER, Jimmie, D. Duncan, Oklahoma 73533 (US) RICKMAN, Richard, D. Duncan Oklahoma 73533 (US) LUO, Hongyu Duncan, Oklahoma 73533 (US) (74) Representative: Cottrill, Emily Elizabeth Helen  A.A. Thornton & Co. 235 High Holborn London WC1V 7LE London WC1V 7LE (GB)