(19)

(11)

EP 2 895 688 A1

(12)

(43) Date of publication: 22.07.2015 Bulletin 2015/30 (21) Application number: 13837009.3 (22) Date of filing: 03.09.2013

(51) International Patent Classification (IPC):  E21B 43/34(2006.01) E21B 43/12(2006.01) (86) International application number: PCT/US2013/057832 (87) International publication number: WO 2014/042909 (20.03.2014 Gazette 2014/12)

(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 (30) Priority: 14.09.2012 US 201213618152 (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77072 (US)	(72) Inventors: TUNHEIM, Ola N-4340 Bryne Rogaland (NO) FREESE, Robert, P. Pittsboro, NC 27312 (US) MACLENNAN, James, Robert Aberdeen Grampian AB24 3ET (GB) (74) Representative: Bennett, Adrian Robert J. et al A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)