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(11)

EP 2 959 092 A1

(12)

(43) Date of publication: 30.12.2015 Bulletin 2015/53 (21) Application number: 14754602.2 (22) Date of filing: 12.02.2014

(51) International Patent Classification (IPC):  E21B 21/01(2006.01) C09K 8/02(2006.01) E21B 21/08(2006.01) (86) International application number: PCT/US2014/016060 (87) International publication number: WO 2014/130323 (28.08.2014 Gazette 2014/35)

(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 Designated Extension States: BA ME (30) Priority: 21.02.2013 US 201313773199 (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77072 (US)	(72) Inventor: NGUYEN, Philip, D. Duncan, OK 73533 (US) (74) Representative: Cottrill, Emily Elizabeth Helen  A.A. Thornton & Co. 10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)