(19)

(11)

EP 2 875 213 A2

(12)

(88) Date of publication A3: 17.07.2014 (43) Date of publication: 27.05.2015 Bulletin 2015/22 (21) Application number: 13742803.3 (22) Date of filing: 18.07.2013

(51) International Patent Classification (IPC):  E21B 47/01(2012.01) E21B 43/12(2006.01) E21B 17/07(2006.01) (86) International application number: PCT/US2013/051111 (87) International publication number: WO 2014/015158 (23.01.2014 Gazette 2014/04)

(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: 18.07.2012 US 201261673095 P (71) Applicant: Sercel-GRC Corporation Tulsa, OK 74115 (US)	(72) Inventors: MORGAN, Josiah Owasso, OK 74055 (US) HOLLIDAY, Brad Claremore, OK 74019 (US) (74) Representative: inCompass IP Europe Limited  4 Bloomsbury Place London WC1A 2QA London WC1A 2QA (GB)