(19)

(11)

EP 4 399 388 A1

(12)

(43) Date of publication: 17.07.2024 Bulletin 2024/29 (21) Application number: 21956685.8 (22) Date of filing: 08.09.2021

(51) International Patent Classification (IPC):  E21B 21/14(2006.01) F24T 10/00(2018.01) E21B 1/24(2006.01) (52) Cooperative Patent Classification (CPC): E21B 21/14; E21B 1/24; F24T 2010/53; F24T 10/10 (86) International application number: PCT/FI2021/050599 (87) International publication number: WO 2023/037033 (16.03.2023 Gazette 2023/11)

(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 (71) Applicant: Senera Oy 01380 Vantaa (FI)	(72) Inventor: MANNER, Mika 02330 Espoo (FI) (74) Representative: Papula Oy  P.O. Box 981 00101 Helsinki 00101 Helsinki (FI)