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(11)

EP 2 906 775 A1

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(43) Date of publication: 19.08.2015 Bulletin 2015/34 (21) Application number: 12889198.3 (22) Date of filing: 29.11.2012

(51) International Patent Classification (IPC):  E21B 21/08(2006.01) E21B 47/10(2012.01) E21B 43/12(2006.01) (86) International application number: PCT/US2012/067046 (87) International publication number: WO 2014/084834 (05.06.2014 Gazette 2014/23)

(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 Designated Extension States: BA ME (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77072 (US)	(72) Inventors: TIPS, Timothy, Rather Montgomery, TX 77356 (US) FREESE, Robert, Paul Pittsboro, NC 27312 (US) (74) Representative: Jennings, Michael John  A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)