(19)

(11)

EP 2 780 540 A1

(12)

(43) Date of publication: 24.09.2014 Bulletin 2014/39 (21) Application number: 11875961.2 (22) Date of filing: 18.11.2011

(51) International Patent Classification (IPC):  E21B 34/08(2006.01) E21B 43/12(2006.01) (86) International application number: PCT/US2011/061331 (87) International publication number: WO 2013/074113 (23.05.2013 Gazette 2013/21)

(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) Inventor: ZHAO, Liang Carrollton, TX (US) (74) Representative: Turner, Craig Robert  A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)