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(11)

EP 2 764 199 A1

(12)

(43) Date of publication: 13.08.2014 Bulletin 2014/33 (21) Application number: 11873581.0 (22) Date of filing: 04.10.2011

(51) International Patent Classification (IPC):  E21B 34/00(2006.01) E21B 17/00(2006.01) E21B 34/06(2006.01) E21B 47/00(2012.01) (86) International application number: PCT/US2011/054799 (87) International publication number: WO 2013/052038 (11.04.2013 Gazette 2013/15)

(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: RINGGENBERG, Paul, D. Carrollton, TX 75006 (US) HUGGINS, Cory, L. Carrollton, TX 75006 (US) (74) Representative: Bennett, Adrian Robert J. et al A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)