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(11)

EP 3 268 570 A1

(12)

(43) Date of publication: 17.01.2018 Bulletin 2018/03 (21) Application number: 16717704.7 (22) Date of filing: 11.03.2016

(51) International Patent Classification (IPC):  E21B 7/28(2006.01) E21B 10/08(2006.01) E21D 9/00(2006.01) (86) International application number: PCT/IB2016/051385 (87) International publication number: WO 2016/142908 (15.09.2016 Gazette 2016/37)

(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: 12.03.2015 IT MO20150054 (71) Applicant: Palmieri S.p.A. 40041 Gaggio Montano (BO) frazione Silla (IT)	(72) Inventor: PALMIERI, Silvano 40041 Gaggio Montano (BO) frazione Silla (IT) (74) Representative: Luppi, Emanuele  Brunacci & Partners S.r.l. Via Scaglia Est, 19-31 41126 Modena 41126 Modena (IT)