(19)

(11)

EP 2 358 968 A1

(12)

(43) Date of publication: 24.08.2011 Bulletin 2011/34 (21) Application number: 08879035.7 (22) Date of filing: 19.12.2008

(51) International Patent Classification (IPC):  E21B 7/00(2006.01) (86) International application number: PCT/US2008/087686 (87) International publication number: WO 2010/071656 (24.06.2010 Gazette 2010/25)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77072 (US)	(72) Inventors: LOVORN, James, R. Carrollton TX 75006 (US) BRUDER, Carlos Carrollton TX 75006 (US) SKINNER, Neal Carrollton TX 75006 (US) KARIGAN, Joe Carrollton TX 75006 (US) (74) Representative: Bennett, Adrian Robert J.  A. A. Thornton & Co. Mechanical 235 High Holborn London WC1 V7LE London WC1 V7LE (GB)