(19)

(11)

EP 2 681 413 A1

(12)

(43) Date of publication: 08.01.2014 Bulletin 2014/02 (21) Application number: 12868923.9 (22) Date of filing: 17.02.2012

(51) International Patent Classification (IPC):  E21B 44/02(2006.01) E21B 47/09(2012.01) E21B 47/125(2012.01) (86) International application number: PCT/US2012/025556 (87) International publication number: WO 2013/126039 (29.08.2013 Gazette 2013/35)

(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 (30) Priority: 03.03.2011 US 201113040180 (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77072 (US)	(72) Inventors: SMITHSON, Mitchell, C. Spring, TX 77380 (US) SHAW, Joel, D. Houston, TX 77019 (US) (74) Representative: Cottrill, Emily Elizabeth Helen  A.A. Thornton & Co. 235 High Holborn London WC1V 7LE London WC1V 7LE (GB)