(19)

(11)

EP 4 232 681 A1

(12)

(43) Date of publication: 30.08.2023 Bulletin 2023/35 (21) Application number: 21802429.7 (22) Date of filing: 25.10.2021

(51) International Patent Classification (IPC):  E21B 7/02(2006.01) (52) Cooperative Patent Classification (CPC): E21B 7/022; E21B 7/024 (86) International application number: PCT/IB2021/059809 (87) International publication number: WO 2022/090886 (05.05.2022 Gazette 2022/18)

(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: KH MA MD TN (30) Priority: 26.10.2020 IT 202000025255 (71) Applicant: Soilmec SpA 47522 Cesena (FC) (IT)	(72) Inventors: DITILLO, Alessandro 47521 Cesena (FC) (IT) MANTOVANI, Francesco I - 47522 Cesena (FC) (IT) (74) Representative: Vitillo, Giuseppe  Barzanò & Zanardo Milano S.p.A. Corso Vittorio Emanuele II, 61 10128 Torino 10128 Torino (IT)