(19)

(11)

EP 3 094 808 A1

(12)

(43) Date of publication: 23.11.2016 Bulletin 2016/47 (21) Application number: 15709620.7 (22) Date of filing: 16.01.2015

(51) International Patent Classification (IPC):  E21B 17/20(2006.01) E21B 19/22(2006.01) (86) International application number: PCT/EP2015/050754 (87) International publication number: WO 2015/107145 (23.07.2015 Gazette 2015/29)

(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 Designated Extension States: BA ME (30) Priority: 17.01.2014 EP 14000169 (71) Applicant: Sandvik Mining and Construction Lyon SAS 69330 Meyzieu (FR)	(72) Inventors: QUENTIN, Vernus F-69330 Meyzieu (FR) POURCENOUX, Jèrôme 69330 Meyzieu (FR) RIPPE, Olivier 69330 Meyzieu (FR)