(19)

(11)

EP 2 710 216 A1

(12)

(43) Date of publication: 26.03.2014 Bulletin 2014/13 (21) Application number: 11865460.7 (22) Date of filing: 16.05.2011

(51) International Patent Classification (IPC):  E21B 7/00(2006.01) E21B 47/00(2012.01) E21B 7/02(2006.01) (86) International application number: PCT/US2011/036616 (87) International publication number: WO 2012/158155 (22.11.2012 Gazette 2012/47)

(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: LOVORN, James, R. Houston, TX 77032 (US) WHITTAKER, Malcolm, E. Houston, TX 77032 (US) LEWIS, Derrick, W. Houston, TX 77032 (US) (74) Representative: Bennett, Adrian Robert J. et al A.A. Thornton & Co. 235 High Holborn London WC1V 7LE London WC1V 7LE (GB)