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(11)

EP 2 694 775 A2

(12)

(88) Date of publication A3: 21.03.2013 (43) Date of publication: 12.02.2014 Bulletin 2014/07 (21) Application number: 12717802.8 (22) Date of filing: 05.04.2012

(51) International Patent Classification (IPC):  E21B 33/129(2006.01) E21B 33/12(2006.01) (86) International application number: PCT/GB2012/000317 (87) International publication number: WO 2012/136960 (11.10.2012 Gazette 2012/41)

(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: 05.04.2011 US 201113080536 (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77072 (US)	(72) Inventor: STANDRIDGE, William Ellis Madill Oklahoma 73446 (US) (74) Representative: HOFFMANN EITLE  Patent- und Rechtsanwälte Arabellastrasse 4 81925 München 81925 München (DE)