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(11)

EP 2 707 570 A1

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(43) Date of publication: 19.03.2014 Bulletin 2014/12 (21) Application number: 11865031.6 (22) Date of filing: 09.05.2011

(51) International Patent Classification (IPC):  E21B 43/12(2006.01) E21B 21/08(2006.01) E21B 34/06(2006.01) (86) International application number: PCT/US2011/035751 (87) International publication number: WO 2012/154167 (15.11.2012 Gazette 2012/46)

(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 RS SE SI SK SM TR (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77072 (US)	(72) Inventor: BERNARD, Christopher, J. Houston, TX 77032 (US) (74) Representative: Bennett, Adrian Robert J.  A.A. Thornton & Co. 235 High Holborn London WC1V 7LE London WC1V 7LE (GB)