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(11)

EP 4 479 618 A1

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(43) Date of publication: 25.12.2024 Bulletin 2024/52 (21) Application number: 23705980.3 (22) Date of filing: 14.02.2023

(51) International Patent Classification (IPC):  E21B 4/18(2006.01) E21B 23/00(2006.01) E21B 23/01(2006.01) E21B 44/02(2006.01) (52) Cooperative Patent Classification (CPC): E21B 4/18; E21B 23/01; E21B 23/001; E21B 44/02 (86) International application number: PCT/EP2023/053680 (87) International publication number: WO 2023/152404 (17.08.2023 Gazette 2023/33)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 14.02.2022 GB 202201938 13.10.2022 GB 202215151 (71) Applicant: GA Drilling, a. s. 811 03 Bratislava (SK)	(72) Inventors: WATSON, Graham 917 01 Trnava (SK) HARRALL, Martin 917 01 Trnava (SK) GLOVER, Anthony Richard 917 01 Trnava (SK) WEBB, Mark 917 01 Trnava (SK) GAJDOS, Matus 917 01 Trnava (SK) SOUTHCOTT, Ian 917 01 Trnava (SK) (74) Representative: Slingsby Partners LLP  1 Kingsway London WC2B 6AN London WC2B 6AN (GB)