(19)

(11)

EP 4 359 614 A1

(12)

(43) Date of publication: 01.05.2024 Bulletin 2024/18 (21) Application number: 22826893.4 (22) Date of filing: 24.06.2022

(51) International Patent Classification (IPC):  E02F 9/28(2006.01) E21B 10/62(2006.01) E21B 10/573(2006.01) E21C 35/183(2006.01) (52) Cooperative Patent Classification (CPC): E21B 10/573; E02F 9/2866; E02F 9/285; E21B 10/36; E21B 10/633 (86) International application number: PCT/AU2022/050645 (87) International publication number: WO 2022/266718 (29.12.2022 Gazette 2022/52)

(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: 25.06.2021 AU 2021901922 (71) Applicant: Commonwealth Scientific and Industrial Research Organisation Acton, Australian Capital Territory 2601 (AU)	(72) Inventors: CLARK, Peter Graham Karana Downs, Queensland 4306 (AU) HARBERS, Craig Riverhills, Queensland 4074 (AU) (74) Representative: HGF  HGF Limited 1 City Walk Leeds LS11 9DX Leeds LS11 9DX (GB)