(19)

(11)

EP 2 611 987 A2

(12)

(88) Date of publication A3: 11.04.2013 (43) Date of publication: 10.07.2013 Bulletin 2013/28 (21) Application number: 11752605.3 (22) Date of filing: 31.08.2011

(51) International Patent Classification (IPC):  E21B 33/12(2006.01) E21B 47/01(2012.01) E21B 49/00(2006.01) (86) International application number: PCT/GB2011/001284 (87) International publication number: WO 2012/028848 (08.03.2012 Gazette 2012/10)

(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: 02.09.2010 US 874917 (71) Applicant: Halliburton Energy Services, Inc. Duncan, OK 73536 (US)	(72) Inventors: LEVIN, Stewart, A. Centennial, CO 80112-1901 (US) DUSTERHOFT, Ronald, G. Katy, Texas 77494 (US) LONGBOTTOM, Jim. Magnolia, Texas 77355 (US) WARPINSKI, Norman, R. Cypress, Texas 77429 (US) VICK, James, D. Jr. Dallas, Texas 75205 (US) (74) Representative: King, Lawrence  A.A. Thornton & Co. 235 High Holborn GB-London WC1V 7LE GB-London WC1V 7LE (GB)