(19)

(11)

EP 4 222 345 A1

(12)

(43) Date of publication: 09.08.2023 Bulletin 2023/32 (21) Application number: 21876451.2 (22) Date of filing: 30.09.2021

(51) International Patent Classification (IPC):  E21B 31/18(2006.01) E21B 10/60(2006.01) E21B 31/20(2006.01) E21B 31/00(2006.01) E21B 17/042(2006.01) (52) Cooperative Patent Classification (CPC): E21B 31/18 (86) International application number: PCT/US2021/052796 (87) International publication number: WO 2022/072591 (07.04.2022 Gazette 2022/14)

(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: 30.09.2020 US 202063085572 P 23.08.2021 US 202163235951 P (71) Applicant: Longyear TM, Inc. Salt Lake City, UT 84119 (US)	(72) Inventors: DRENTH, Christopher, L. Callander, ON P0H 1H0 (CA) PRIMEVERT, Vincent Toronto, ON M6A 3E7 (CA) BRUBACHER, Adrian North Bay, ON P1B 2Z1 (CA) (74) Representative: Walker, Stephen  Lincoln IP 4 Rubislaw Place Aberdeen, Aberdeenshire AB10 1XN Aberdeen, Aberdeenshire AB10 1XN (GB)