(19)

(11)

EP 2 524 103 A2

(12)

(88) Date of publication A3: 20.10.2011 (43) Date of publication: 21.11.2012 Bulletin 2012/47 (21) Application number: 11733546.3 (22) Date of filing: 18.02.2011

(51) International Patent Classification (IPC):  E21B 10/22(2006.01) F16C 33/76(2006.01) (86) International application number: PCT/US2011/025427 (87) International publication number: WO 2011/088477 (21.07.2011 Gazette 2011/29)

(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: 12.01.2010 US 685807 (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77072 (US)	(72) Inventors: SUI, Ping, C. Houston, TX 77032 (US) WEAVER, Gary, E. Houston, TX 77032 (US) (74) Representative: Bennett, Adrian Robert J.  A.A. Thornton & Co. 235 High Holborn London WC1V 7LE London WC1V 7LE (GB)