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(11)

EP 2 459 499 A1

(12)

(43) Date of publication: 06.06.2012 Bulletin 2012/23 (21) Application number: 10739907.3 (22) Date of filing: 30.07.2010

(51) International Patent Classification (IPC):  C04B 35/52(2006.01) E21B 10/00(2006.01) C04B 37/00(2006.01) (86) International application number: PCT/EP2010/061144 (87) International publication number: WO 2011/012708 (03.02.2011 Gazette 2011/05)

(84) Designated Contracting States: AL 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 (30) Priority: 31.07.2009 GB 0913304 31.07.2009 US 230316 P (71) Applicants: Element Six Limited County Clare (IE) Baker Hughes Incorporated Houston, TX 77019-2118 (US)	(72) Inventors: SCOTT, Danny Eugene The Woodlands, Texas 77380-3615 (US) SCHMITZ, Kurtis Karl Houston, Texas 77019-2118 (US) VAN DER RIET, Clement David County Clare (IE) CAN, Antionette 1560 Springs (ZA) (74) Representative: Reeve, Anna Elizabeth et al Element Six Limited 3rd Floor, Building 4, Chiswick Park 566 Chiswick High Road GB-London W4 5YE GB-London W4 5YE (GB)