(19)

(11)

EP 4 058 654 A1

(12)

(43) Date of publication: 21.09.2022 Bulletin 2022/38 (21) Application number: 20804652.4 (22) Date of filing: 06.11.2020

(51) International Patent Classification (IPC):  E21B 33/08(2006.01) E21B 33/127(2006.01) E21B 21/08(2006.01) (52) Cooperative Patent Classification (CPC): E21B 33/085; E21B 21/08; E21B 33/127 (86) International application number: PCT/GB2020/052823 (87) International publication number: WO 2021/094717 (20.05.2021 Gazette 2021/20)

(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: 11.11.2019 GB 201916384 (71) Applicant: Oil States Industries (UK) Limited Nigg, Aberdeen, Scotland AB12 3GQ (GB)	(72) Inventors: WILSON, Kevin Renfrew P'A4 8RJ (GB) JOHNSTON, Richard West Lothian EH49 6ES (GB) STEPHEN, Garry Robert Angus DD10 9AW (GB) (74) Representative: Murgitroyd & Company  Murgitroyd House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)