(19)

(11)

EP 2 252 768 A2

(12)

(88) Date of publication A3: 27.08.2009 (43) Date of publication: 24.11.2010 Bulletin 2010/47 (21) Application number: 08866443.8 (22) Date of filing: 11.12.2008

(51) International Patent Classification (IPC):  F01C 1/107(2006.01) C08K 3/04(2006.01) E21B 11/00(2006.01) F04C 2/107(2006.01) C08K 3/34(2006.01) E21B 43/12(2006.01) (86) International application number: PCT/US2008/013571 (87) International publication number: WO 2009/085112 (09.07.2009 Gazette 2009/28)

(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 Designated Extension States: AL BA MK RS (30) Priority: 18.12.2007 US 2710 (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77072 (US)	(72) Inventors: SLAY, Jeremy, Buc Fort Worth TX 76116 (US) RAY, Thomas, Wayne Collin TX 75075 (US) SNYDER, John, K. Cypress, TX 77429 (US) GAWSKI, Victor Aberdeenshire AB23 8XA (GB) (74) Representative: Cottrill, Emily Elizabeth Helen  A.A. Thornton & Co. 235 High Holborn GB-London WC1V 7LE GB-London WC1V 7LE (GB)