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EP 2 855 839 A1

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(43) Date of publication: 08.04.2015 Bulletin 2015/15 (21) Application number: 12881765.7 (22) Date of filing: 23.07.2012

(51) International Patent Classification (IPC):  E21B 47/0224(2012.01) E21B 44/02(2006.01) E21B 47/002(2012.01) (86) International application number: PCT/US2012/047891 (87) International publication number: WO 2014/018003 (30.01.2014 Gazette 2014/05)

(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: DAVIS, Nancy, S. Carrollton, TX 75006 (US) BUTLER, Cody, N. Carrollton, TX 75006 (US) LOVORN, James, R. Houston, TX 77032 (US) (74) Representative: Jennings, Michael John et al A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)