(19)

(11)

EP 3 347 164 A1

(12)

(43) Date of publication: 18.07.2018 Bulletin 2018/29 (21) Application number: 16845011.2 (22) Date of filing: 08.09.2016

(51) International Patent Classification (IPC):  B24D 3/10(2006.01) B24D 99/00(2010.01) E21B 10/567(2006.01) B24D 18/00(2006.01) E21B 10/55(2006.01) (86) International application number: PCT/US2016/050673 (87) International publication number: WO 2017/044561 (16.03.2017 Gazette 2017/11)

(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: MA MD (30) Priority: 08.09.2015 US 201514847586 (71) Applicant: Baker Hughes, a GE company, LLC Houston, TX 77210-4740 (US)	(72) Inventor: BIRD, Marc, W. Houston, TX 77042 (US) (74) Representative: Dehns  St. Brides House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)