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(11)

EP 2 715 035 A1

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(43) Date of publication: 09.04.2014 Bulletin 2014/15 (21) Application number: 11866637.9 (22) Date of filing: 02.06.2011

(51) International Patent Classification (IPC):  E21B 17/00(2006.01) E21B 47/00(2012.01) E21B 19/00(2006.01) (86) International application number: PCT/US2011/038838 (87) International publication number: WO 2012/166137 (06.12.2012 Gazette 2012/49)

(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 (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77072 (US)	(72) Inventors: MAIDA, John, L. Jr. Houston, Texas 77064 (US) SKINNER, Neal, G. Carrollton, TX 75006 (US) (74) Representative: HOFFMANN EITLE  Patent- und Rechtsanwälte Arabellastrasse 4 81925 München 81925 München (DE)