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(11)

EP 2 834 463 A1

(12)

(43) Date of publication: 11.02.2015 Bulletin 2015/07 (21) Application number: 13772431.6 (22) Date of filing: 05.03.2013

(51) International Patent Classification (IPC):  E21D 20/00(2006.01) E21D 20/02(2006.01) E21B 7/00(2006.01) (86) International application number: PCT/AU2013/000206 (87) International publication number: WO 2013/149283 (10.10.2013 Gazette 2013/41)

(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: 04.04.2012 AU 2012901352 (71) Applicant: Rambor Pty Limited Nowra, NSW 2541 (AU)	(72) Inventor: MASTALIR, Peter South Nowra, NSW 2541 (AU) (74) Representative: Intès, Didier Gérard André et al Cabinet Beau de Loménie 158, rue de l'Université 75340 Paris Cedex 07 75340 Paris Cedex 07 (FR)