(19)

(11)

EP 3 253 949 A1

(12)

(43) Date of publication: 13.12.2017 Bulletin 2017/50 (21) Application number: 16746003.9 (22) Date of filing: 03.02.2016

(51) International Patent Classification (IPC):  E21D 21/00(2006.01) E21B 10/00(2006.01) E21D 20/00(2006.01) F16B 13/00(2006.01) (86) International application number: PCT/AU2016/050061 (87) International publication number: WO 2016/123668 (11.08.2016 Gazette 2016/32)

(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: 04.02.2015 AU 2015900337 (71) Applicant: Fero Group Pty Ltd Kewdale, Western Australia 6105 (AU)	(72) Inventor: MCLAREN, Matthew David Quinns Rocks, Western Australia 6030 (AU) (74) Representative: Script IP Limited  Turnpike House 18 Bridge Street Frome Somerset BA11 1BB Frome Somerset BA11 1BB (GB)