(19)

(11)

EP 3 983 636 A1

(12)

(43) Date of publication: 20.04.2022 Bulletin 2022/16 (21) Application number: 20732202.5 (22) Date of filing: 10.06.2020

(51) International Patent Classification (IPC):  E21B 10/36(2006.01) E21B 17/10(2006.01) E21B 17/042(2006.01) (52) Cooperative Patent Classification (CPC): E21B 10/36; E21B 17/042; E21B 17/1078 (86) International application number: PCT/EP2020/066081 (87) International publication number: WO 2020/249611 (17.12.2020 Gazette 2020/51)

(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 Designated Validation States: KH MA MD TN (30) Priority: 14.06.2019 EP 19180284 (71) Applicant: Sandvik Mining and Construction Tools AB 81181 Sandviken (SE)	(72) Inventors: BJÖRK, Fredrik 81134 Sandviken (SE) NORMAN, Andreas 81181 Sandviken (SE) YASSERI, Ali 81181 Sandviken (SE) (74) Representative: Sandvik  Sandvik Mining and Construction Oy Patent Department PL 100 33311 Tampere 33311 Tampere (FI)