(19)

(11)

EP 2 776 655 A1

(12)

(43) Date of publication: 17.09.2014 Bulletin 2014/38 (21) Application number: 11808010.0 (22) Date of filing: 11.11.2011

(51) International Patent Classification (IPC):  E21B 19/15(2006.01) (86) International application number: PCT/IT2011/000374 (87) International publication number: WO 2013/069033 (16.05.2013 Gazette 2013/20)

(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 (71) Applicant: THS S.R.L. I-48121 Ravenna (IT)	(72) Inventor: SPADONI, Luciano I-48123 Ravenna (IT) (74) Representative: Modiano, Micaela Nadia et al Modiano & Partners (IT) Via Meravigli, 16 20123 Milano 20123 Milano (IT)