(19)

(11)

EP 4 816 663 A1

(12)

(43) Date of publication: 07.10.2026 Bulletin 2026/41 (21) Application number: 24898314.0 (22) Date of filing: 27.11.2024

(51) International Patent Classification (IPC):  E21B 29/02(2006.01) E21B 29/06(2006.01) E21B 29/00(2006.01) E21B 7/06(2006.01) (52) Cooperative Patent Classification (CPC): E21B 7/061; E21B 41/0035 (86) International application number: PCT/NO2024/050258 (87) International publication number: WO 2025/116739 (05.06.2025 Gazette 2025/23)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: GE KH MA MD TN (30) Priority: 27.11.2023 NO 20231291 (71) Applicant: DSOLVE AS 7025 Trondheim (NO)	(72) Inventor: DELGADO, Carlos J. 7025 Trondheim (NO) (74) Representative: Acapo Onsagers AS  Edvard Griegs vei 1 5059 Bergen 5059 Bergen (NO)