(19)

(11)

EP 2 847 414 A2

(12)

(88) Date of publication A3: 22.05.2014 (43) Date of publication: 18.03.2015 Bulletin 2015/12 (21) Application number: 13731890.3 (22) Date of filing: 03.05.2013

(51) International Patent Classification (IPC):  E21B 15/00(2006.01) (86) International application number: PCT/IB2013/053529 (87) International publication number: WO 2013/168064 (14.11.2013 Gazette 2013/46)

(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: 09.05.2012 IT TO20120414 (71) Applicant: Drillmec S.p.A. 29027 Gariga di Podenzano (PC) (IT)	(72) Inventor: FERRARI, Stefano I-29027 Barbiano (PR) (IT) (74) Representative: Vitillo, Giuseppe  Barzanò & Zanardo Milano S.p.A. Corso Vittorio Emanuele II, 61 10128 Torino 10128 Torino (IT)