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EP 2 689 102 A1

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(43) Date of publication: 29.01.2014 Bulletin 2014/05 (21) Application number: 11861857.8 (22) Date of filing: 22.03.2011

(51) International Patent Classification (IPC):  E21B 43/116(2006.01) E21B 28/00(2006.01) E21B 43/119(2006.01) E21B 7/24(2006.01) (86) International application number: PCT/US2011/029412 (87) International publication number: WO 2012/128759 (27.09.2012 Gazette 2012/39)

(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: HALES, John, H. Carrollton, TX 75006 (US) BURLESON, John, D. Carrollton, TX 75006 (US) MARTINEZ, Samuel Carrollton, TX 75006 (US) (74) Representative: HOFFMANN EITLE  Patent- und Rechtsanwälte Arabellastrasse 4 81925 München 81925 München (DE)