(19)

(11)

EP 2 895 679 A1

(12)

(43) Date of publication: 22.07.2015 Bulletin 2015/30 (21) Application number: 13837637.1 (22) Date of filing: 13.09.2013

(51) International Patent Classification (IPC):  E21B 17/042(2006.01) E21B 19/16(2006.01) (86) International application number: PCT/US2013/059716 (87) International publication number: WO 2014/043505 (20.03.2014 Gazette 2014/12)

(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: 13.09.2012 US 201261700401 P (71) Applicant: Longyear TM, Inc. South Jordan, UT 84095 (US)	(72) Inventor: DRENTH, Christopher, L. Draper, UT 84020 (US) (74) Representative: Walker, Stephen et al Lincoln IP 9 Victoria Street Aberdeen Aberdeenshire AB10 1XB Aberdeen Aberdeenshire AB10 1XB (GB)