(19)

(11)

EP 2 809 878 A1

(12)

(43) Date of publication: 10.12.2014 Bulletin 2014/50 (21) Application number: 12877289.4 (22) Date of filing: 25.05.2012

(51) International Patent Classification (IPC):  E21B 44/06(2006.01) E21B 4/02(2006.01) (86) International application number: PCT/US2012/039586 (87) International publication number: WO 2013/176677 (28.11.2013 Gazette 2013/48)

(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) Inventor: SAEED, Saad Houston, TX 77032 (US) (74) Representative: Hoffmann Eitle  Patent- und Rechtsanwälte PartmbB Arabellastraße 30 81925 München 81925 München (DE)