(19)
(11) EP 3 874 118 A1

(12)

(43) Date of publication:
08.09.2021 Bulletin 2021/36

(21) Application number: 19794691.6

(22) Date of filing: 23.10.2019
(51) International Patent Classification (IPC): 
E21B 31/00(2006.01)
(86) International application number:
PCT/IB2019/059038
(87) International publication number:
WO 2020/089734 (07.05.2020 Gazette 2020/19)
(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: 29.10.2018 IT 201800009857

(71) Applicant: ENI S.p.A.
00144 Roma (IT)

(72) Inventors:
  • TOFFOLO, Gilberto
    4064 Stavanger (NO)
  • BIONDI, Andrea
    30175 Venezia Marghera (VE) (IT)
  • FERRARA, Paolo
    20097 San Donato Milanese (MI) (IT)

(74) Representative: Bottero, Carlo et al
Barzanò & Zanardo Milano S.p.A. Via Borgonuovo, 10
20121 Milano
20121 Milano (IT)

   


(54) SYSTEM FOR UNSTICKING PIPES OF A DRILL STRING OF A DRILLING APPARATUS