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(11)

EP 4 558 697 A1

(12)

(43) Date of publication: 28.05.2025 Bulletin 2025/22 (21) Application number: 23750698.5 (22) Date of filing: 21.07.2023

(51) International Patent Classification (IPC):  E21B 7/06(2006.01) E21B 41/00(2006.01) (52) Cooperative Patent Classification (CPC): E21B 7/065; E21B 41/0085 (86) International application number: PCT/GB2023/051938 (87) International publication number: WO 2024/018233 (25.01.2024 Gazette 2024/04)

(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: 21.07.2022 GB 202210723 (71) Applicant: Enteq Technologies Plc Ascot Berkshire SL5 7HP (GB)	(72) Inventor: BIRD, Neil Ascot, Berkshire SL5 7HP (GB) (74) Representative: Reddie & Grose LLP  The White Chapel Building 10 Whitechapel High Street London E1 8QS London E1 8QS (GB)