(19)

(11)

EP 2 569 507 A2

(12)

(88) Date of publication A3: 27.12.2012 (43) Date of publication: 20.03.2013 Bulletin 2013/12 (21) Application number: 11719362.3 (22) Date of filing: 28.04.2011

(51) International Patent Classification (IPC):  E21B 33/138(2006.01) E21B 43/16(2006.01) E21B 47/10(2012.01) (86) International application number: PCT/GB2011/000669 (87) International publication number: WO 2011/141687 (17.11.2011 Gazette 2011/46)

(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: 11.05.2010 US 777965 (71) Applicant: Halliburton Energy Services, Inc. Duncan, OK 73536 (US)	(72) Inventors: CULLICK, Alvin, S. Thornton, CO 80602-8864 (US) FARABEE, Leldon, M. Houston, TX 77077 (US) WARPINSKI, Norm, R. Cypress, TX 77429 (US) SHELLEY, Robert, F. Katy, TX 77450 (US) LEVIN, Stewart, A. Menlo Park, CA 94025-5935 (US) (74) Representative: Ono, Shusuke  A.A. Thornton & Co. 235 High Holborn London WC1V 7LE London WC1V 7LE (GB)