(19)

(11)

EP 4 352 448 A2

(12)

(88) Date of publication A3: 16.02.2023 (43) Date of publication: 17.04.2024 Bulletin 2024/16 (21) Application number: 22820676.9 (22) Date of filing: 09.06.2022

(51) International Patent Classification (IPC):  F42B 3/11(2006.01) B32B 5/02(2006.01) F42D 99/00(2009.01) E21C 39/00(2006.01) F42D 1/00(2006.01) B32B 27/04(2006.01) B32B 27/00(2006.01) (52) Cooperative Patent Classification (CPC): E21B 43/1185; E21B 43/11; E21B 47/017; E21B 47/06 (86) International application number: PCT/SG2022/050396 (87) International publication number: WO 2022/260600 (15.12.2022 Gazette 2022/50)

(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: 11.06.2021 SG 10202106276P (71) Applicant: Orica International Pte Ltd Singapore 079120 (SG)	(72) Inventors: APPLEBY, Rodney Wayne Labrador, Queensland 4215 (AU) PIPER, David James Eastman Bolton Point, New South Wales 2283 (AU) (74) Representative: Regimbeau  20, rue de Chazelles 75847 Paris Cedex 17 75847 Paris Cedex 17 (FR)