(19)

(11)

EP 2 726 710 A1

(12)

(43) Date of publication: 07.05.2014 Bulletin 2014/19 (21) Application number: 11868574.2 (22) Date of filing: 30.06.2011

(51) International Patent Classification (IPC):  E21B 49/10(2006.01) E21B 47/00(2012.01) (86) International application number: PCT/US2011/042631 (87) International publication number: WO 2013/002803 (03.01.2013 Gazette 2013/01)

(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: VAN ZUILEKOM, Anthony, Herman Houston, Texas 77064 (US) WILSON, Jim, Randall Montgomery, Texas 77356 (US) (74) Representative: HOFFMANN EITLE  Patent- und Rechtsanwälte Arabellastrasse 4 81925 München 81925 München (DE)