(19)

(11)

EP 4 308 786 A1

(12)

(43) Date of publication: 24.01.2024 Bulletin 2024/04 (21) Application number: 22719044.4 (22) Date of filing: 21.03.2022

(51) International Patent Classification (IPC):  E21B 17/05(2006.01) E21B 33/13(2006.01) (52) Cooperative Patent Classification (CPC): E21B 33/13; E21B 17/05 (86) International application number: PCT/NO2022/050070 (87) International publication number: WO 2022/197189 (22.09.2022 Gazette 2022/38)

(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: 19.03.2021 NO 20210361 (71) Applicant: Archer Oiltools AS 4068 Stavanger (NO)	(72) Inventor: TORVESTAD, Bjørn Tore 4020 Stavanger (NO) (74) Representative: Acapo AS  Edvard Griegs vei 1 5059 Bergen 5059 Bergen (NO)