(19)

(11)

EP 2 925 958 A1

(12)

(43) Date of publication: 07.10.2015 Bulletin 2015/41 (21) Application number: 12889629.7 (22) Date of filing: 03.12.2012

(51) International Patent Classification (IPC):  E21B 43/12(2006.01) E21B 47/10(2012.01) (86) International application number: PCT/US2012/067604 (87) International publication number: WO 2014/088545 (12.06.2014 Gazette 2014/24)

(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: MORGAN-SMITH, Jonathan N-4065 Stavanger (NO) HEPBURN, Neil N-4065 Stavanger (NO) (74) Representative: Bennett, Adrian Robert J. et al A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)