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EP 3 368 723 A2

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(88) Date of publication A3: 13.07.2017 (43) Date of publication: 05.09.2018 Bulletin 2018/36 (21) Application number: 16815708.9 (22) Date of filing: 31.10.2016

(51) International Patent Classification (IPC):  E02B 17/02(2006.01) E02B 17/00(2006.01) E21B 19/00(2006.01) E21B 15/02(2006.01) (86) International application number: PCT/DK2016/000042 (87) International publication number: WO 2017/071711 (04.05.2017 Gazette 2017/18)

(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: MA MD (30) Priority: 29.10.2015 DK 201500668 23.12.2015 GB 201522856 21.01.2016 GB 201601175 23.04.2016 GB 201607101 23.04.2016 GB 201607104 23.04.2016 GB 201607102 25.04.2016 GB 201607180 25.04.2016 GB 201607183 06.10.2016 WO PCT/DK2016/000036 (71) Applicants: Mærsk Drilling A/S 2800 Kgs. Lyngby (DK) Mærsk Olie og Gas A/S 2100 Copenhagen (DK)

(72) Inventors: KANNEGAARD, Michael 2820 Gentofte (DK) GILL, John, Anthony Mansfield Nottinghamshire NG19 7AE (GB) LØNSTRUP, Jeanne, Mia 1874 Frederiksberg C (DK) VAN DER BRUG, Meinte 1362 Copenhagen K (DK) (74) Representative: Docherty, Andrew John  Marks & Clerk LLP Aurora 120 Bothwell Street Glasgow G2 7JS Glasgow G2 7JS (GB)