(19)

(11)

EP 3 877 625 A1

(12)

(43) Date of publication: 15.09.2021 Bulletin 2021/37 (21) Application number: 19804796.1 (22) Date of filing: 08.11.2019

(51) International Patent Classification (IPC):  E21B 47/12(2012.01) E21B 41/00(2006.01) (52) Cooperative Patent Classification (CPC): E21B 2200/22; E21B 47/12 (86) International application number: PCT/GB2019/053170 (87) International publication number: WO 2020/095061 (14.05.2020 Gazette 2020/20)

(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 Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 08.11.2018 GB 201818221 (71) Applicant: Expro North Sea Limited Aberdeen AB21 0LQ (GB)	(72) Inventor: ROGACHEVA, Alexandra Vasil'evna Southampton SO17 1EL (GB) (74) Representative: McGlashan, Graham Stewart  Marks & Clerk LLP Aurora 120 Bothwell Street Glasgow G2 7JS Glasgow G2 7JS (GB)