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(11)

EP 2 872 731 A1

(12)

(43) Date of publication: 20.05.2015 Bulletin 2015/21 (21) Application number: 12880802.9 (22) Date of filing: 13.07.2012

(51) International Patent Classification (IPC):  E21B 33/12(2006.01) E21B 23/06(2006.01) (86) International application number: PCT/US2012/046813 (87) International publication number: WO 2014/011194 (16.01.2014 Gazette 2014/03)

(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) Inventor: STOKES, Matthew Bradley Fort Worth, Texas 76137 (US) (74) Representative: Bennett, Adrian Robert J.  A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)