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(11)

EP 2 855 841 A1

(12)

(43) Date of publication: 08.04.2015 Bulletin 2015/15 (21) Application number: 12878338.8 (22) Date of filing: 05.06.2012

(51) International Patent Classification (IPC):  E21B 47/13(2012.01) E21B 47/12(2012.01) (86) International application number: PCT/US2012/040846 (87) International publication number: WO 2013/184096 (12.12.2013 Gazette 2013/50)

(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. Carrollton, TX 75006 (US)	(72) Inventors: RINGGENBERG, Paul, David Frisco, TX 75034 (US) HERMAN, Paul, I. Plano, TX 75025 (US) (74) Representative: Bennett, Adrian Robert J. et al A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)