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(11)

EP 2 906 773 A1

(12)

(43) Date of publication: 19.08.2015 Bulletin 2015/34 (21) Application number: 12886400.6 (22) Date of filing: 09.10.2012

(51) International Patent Classification (IPC):  E21B 17/046(2006.01) E21B 7/04(2006.01) E21B 19/24(2006.01) (86) International application number: PCT/US2012/059308 (87) International publication number: WO 2014/058412 (17.04.2014 Gazette 2014/16)

(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: TELFER, Stuart, Alexander Stonehaven Aberdeenshire AB39 3LB (GB) DAHL, Espen RJ 22421 Rio De Janeiro (BR) STEELE, David, Joe Arlington, TX 76017 (US) DUPLER, Lester, Barett Providence Village, TX 76227 (US) (74) Representative: Bennett, Adrian Robert J. et al A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)