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(11)

EP 2 785 949 A1

(12)

(43) Date of publication: 08.10.2014 Bulletin 2014/41 (21) Application number: 11876488.5 (22) Date of filing: 30.11.2011

(51) International Patent Classification (IPC):  E21B 10/573(2006.01) E21B 12/00(2006.01) (86) International application number: PCT/US2011/062654 (87) International publication number: WO 2013/081606 (06.06.2013 Gazette 2013/23)

(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: DUCKWORTH, David, P. Conroe, TX 77385 (US) SUI, Ping, C. Conroe, TX 77385 (US) (74) Representative: Bennett, Adrian Robert J. et al A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)